Invalid dinosaur
From EverybodyWiki Bios & Wiki
An Invalid dinosaur is a dinosaur that was mistakenly identified—from fossil remains—as a unique dinosaur species but was actually an already-known species or a mixture of fossilized bones from more than one species.
Examples
- Aachenosaurus: actually petrified wood, the fossilized remains of a plant.
- Apatodon
- Archaeoraptor
- Eoplophysis
- Lametasaurus
- Walgettosuchus
- Willinakaqe
The formatted list below merges the template headings, the provided classic cartoon stars, and the initial set of prehistoric reptiles based on Dr. Thomas R. Holtz Jr.’s macro-evolutionary tracking format.
Saurischia
Suborder: Theropoda | Infraorder: Ceratosauria
| Name Meaning | Clade / Family | Location | Temporal Range | Height | Length | Mass | Diet | Formation | Author / Discoverer |
|---|---|---|---|---|---|---|---|---|---|
| Coelophysis bauri
• Hollow form |
Podokesauridae | New Mexico & Arizona, USA | Late Triassic (~228–201 Ma) | ~0.9 m (3 ft) | ~3 m (10 ft) | ~15–20 kg (33–44 lbs) | Carnivore | Chinle Formation / Ghost Ranch | Edward Drinker Cope (1889) |
| Podokesaurus holyokensis
• Swift-footed lizard |
Podokesauridae | Massachusetts, USA | Early Jurassic (~190 Ma) | ~0.3 m (1 ft) | ~1 m (3.3 ft) | ~1–4 kg (2–9 lbs) | Carnivore | Portland Formation | Mignon Talbot (1911) |
| Procompsognathus triassicus
• Before elegant jaw |
Podokesauridae | Germany | Late Triassic (~210 Ma) | ~0.4 m (1.3 ft) | ~1 m (3.3 ft) | ~1 kg (2.2 lbs) | Carnivore / Insectivore | Stubensandstein Member (Löwenstein Formation) | Eberhard Fraas (1913) |
| Ceratosaurus nasicornis
• Horned lizard |
Ceratosauridae | Utah & Colorado, USA; Portugal | Late Jurassic (~153–148 Ma) | ~2 m (6.6 ft) | ~5.5–7 m (18–23 ft) | ~500–1,000 kg | Carnivore | Morrison Formation | Othniel Charles Marsh (1884) |
| Dilophosaurus wetherilli
• Two-crested lizard |
Dilophosauridae | Arizona, USA | Early Jurassic (~193 Ma) | ~2 m (6.6 ft) | ~7 m (23 ft) | ~400 kg (880 lbs) | Carnivore | Kayenta Formation | Samuel Paul Welles (1954) |
| Carnotaurus sastrei
• Meat-eating bull |
Abelisauridae | Chubut Province, Argentina | Late Cretaceous (~72–69 Ma) | ~2.5–3 m (8–10 ft) | ~7.5–9 m (25–30 ft) | ~1,350 kg (1.5 tons) | Carnivore | La Colonia Formation | José Bonaparte (1985) |
| Majungasaurus crenatissimus
• Mahajanga lizard |
Abelisauridae | Madagascar | Late Cretaceous (~70–66 Ma) | ~2 m (6.6 ft) | ~6–7 m (20–23 ft) | ~1,100 kg (1.1 tons) | Carnivore (Cannibalistic) | Maevarano Formation | René Lavocat (1955) |
Suborder: Theropoda | Infraorder: Carnosauria
| Name Meaning | Clade / Family | Location | Temporal Range | Height | Length | Mass | Diet | Formation | Author / Discoverer |
|---|---|---|---|---|---|---|---|---|---|
| Eustreptospondylus oxoniensis
• True well-curved vertebra of Oxford |
Megalosauridae | Oxfordshire, England | Middle Jurassic (~163 Ma) | ~1.5 m (5 ft) | ~4.6 m (15 ft) | ~500 kg (1,100 lbs) | Carnivore / Piscivore | Oxford Clay Formation | Sir Richard Owen (1841) / Walker (1964) |
| Poekilopleuron bucklandii
• Varied ribs of Buckland |
Megalosauridae | Normandy, France | Middle Jurassic (~167 Ma) | ~2 m (6.5 ft) | ~7 m (23 ft) | ~1,000 kg (1 ton) | Carnivore | Calcaire de Caen | Jacques Amand Eudes-Deslongchamps (1838) |
| Torvosaurus gurneyi
• Savage lizard of James Gurney |
Megalosauridae | Portugal | Late Jurassic (~150 Ma) | ~3.5 m (11.5 ft) | ~10 m (33 ft) | ~4,000–5,000 kg | Carnivore | Lourinhã Formation | Christophe Hendrickx & Octávio Mateus (2014) |
| Acrocanthosaurus atokensis
• High-spined lizard from Atoka |
Carcharodontosauridae | Oklahoma, Texas, & Maryland, USA | Early Cretaceous (~113–110 Ma) | ~4 m (13 ft) | ~11.5 m (38 ft) | ~5,700–6,200 kg | Carnivore | Antlers Formation / Twin Mountains | J. Willis Stovall & Wann Langston Jr. (1950) |
| Giganotosaurus carolinii
• Giant southern lizard of Carolini |
Carcharodontosauridae | Patagonia, Argentina | Late Cretaceous (~98–97 Ma) | ~4 m (13 ft) | ~12–13 m (40–43 ft) | ~7,000–8,500 kg | Carnivore | Candeleros Formation | Rodolfo Coria & Leonardo Salgado (1995) |
| Allosaurus europaeus
• Different European lizard |
Allosauridae | Portugal; New Mexico, USA | Late Jurassic (~150 Ma) | ~3.7 m (12 ft) | ~12 m (40 ft) | ~1,000–1,500 kg | Carnivore | Lourinhã; Morrison Formation | Mateus et al. (2006) |
| Yangchuanosaurus zigongensis
• Yangchuan lizard from Zigong |
Allosauridae | Sichuan, China | Middle Jurassic (~165 Ma) | ~2.5 m (8 ft) | ~8 m (26 ft) | ~1,300 kg (1.4 tons) | Carnivore | Upper Shaximiao Formation | Gao Yuhui (1993) |
| Baryonyx walkeri
• Heavy claw of Walker |
Spinosauridae | Surrey, England; Spain | Early Cretaceous (~125–121 Ma) | ~2.5 m (8 ft) | ~10 m (33 ft) | ~1,200–1,700 kg | Piscivore / Carnivore | Weald Clay Formation | Alan J. Walker (1983) / Charig & Milner (1986) |
| Spinosaurus aegyptiacus
• Spine lizard from Egypt |
Spinosauridae | Egypt & Morocco | Late Cretaceous (~99–93 Ma) | ~4.5 m (15 ft) (with sail) | ~14 m (46 ft) | ~6,000–7,500 kg | Piscivore / Generalist | Bahariya Formation / Kem Kem | Ernst Stromer (1915) |
| Suchomimus tenerensis
• Crocodile mimic from Ténéré |
Spinosauridae | Ténéré Desert, Niger | Early Cretaceous (~121–112 Ma) | ~3 m (10 ft) | ~9.5–11 m (31–36 ft) | ~3,000–5,200 kg | Piscivore / Carnivore | Elrhaz Formation | Paul Sereno et al. (1998) |
| Albertosaurus sarcophagus
• Flesh-eating Alberta lizard |
Tyrannosauridae | Alberta, Canada | Late Cretaceous (~71–68 Ma) | ~3 m (10 ft) | ~8–9 m (26–30 ft) | ~1,700–2,500 kg | Carnivore | Horseshoe Canyon Formation | Henry Fairfield Osborn (1905) |
| Gorgosaurus libratus
• Fierce balanced lizard |
Tyrannosauridae | Alberta, Canada; Montana, USA | Late Cretaceous (~76–75 Ma) | ~2.8 m (9 ft) | ~8–9 m (26–30 ft) | ~2,000–2,400 kg | Carnivore | Dinosaur Park Formation | Lawrence Lambe (1914) |
| Qianzhousaurus sinensis
• Qianzhou lizard from China |
Tyrannosauridae | Ganzhou, China | Late Cretaceous (~66 Ma) | ~2.5 m (8 ft) | ~8–9 m (26–30 ft) | ~800–1,000 kg | Carnivore | Nanxiong Formation | Junchang Lü et al. (2014) |
| Tarbosaurus bataar
• Alarming hero lizard |
Tyrannosauridae | Mongolia & China | Late Cretaceous (~70 Ma) | ~3.5 m (11.5 ft) | ~10–12 m (33–39 ft) | ~4,500–5,000 kg | Carnivore | Nemegt Formation | Evgeny Maleev (1955) |
| Tyrannosaurus rex
• King of the tyrant lizards |
Tyrannosauridae | Western North America | Late Cretaceous (~68–66 Ma) | ~3.7–6 m (12–19.7 ft) | ~12–15 m (40–49.2 ft) | ~8,000–9,500 kg | Apex Carnivore / Scavenger | Hell Creek Formation | Barnum Brown (1902) / Osborn (1905) |
Suborder: Theropoda | Infraorder: Coelurosauria
| Name Meaning | Clade / Family | Location | Temporal Range | Height | Length | Mass | Diet | Formation | Author / Discoverer |
|---|---|---|---|---|---|---|---|---|---|
| Coelurus fragilis
• Hollow tail |
Coeluridae | Wyoming, USA | Late Jurassic (~153–150 Ma) | ~0.7 m (2.3 ft) | ~2.4 m (8 ft) | ~13–20 kg (28–44 lbs) | Carnivore / Insectivore | Morrison Formation | Othniel Charles Marsh (1879) |
| Ornitholestes hermanni
• Bird robber of Hermann |
Coeluridae | Wyoming, USA | Late Jurassic (~154 Ma) | ~0.8 m (2.6 ft) | ~2 m (6.6 ft) | ~12–15 kg (26–33 lbs) | Carnivore | Morrison Formation | Henry Fairfield Osborn (1903) |
| Moros intrepidus
• Impending doom / Intrepid harbinger |
Tyrannosauroidea | Utah, USA | Late Cretaceous (~96 Ma) | ~1.2 m (4 ft) | ~2.5 m (8 ft) | ~78 kg (170 lbs) | Carnivore | Cedar Mountain Formation | Lindsay Zanno et al. (2019) |
| Nanotyrannus lethaeus
• Dwarf tyrant of the River Lethe |
Tyrannosauroidea | Montana, USA | Late Cretaceous (~67–66 Ma) | ~1.5 m (5 ft) | ~4.5–5 m (15–16 ft) | ~700–1,000 kg | Slender Pursuit Carnivore | Hell Creek Formation | Bakker et al. (1988) / Zanno & Napoli (2025) |
| Compsognathus longipes
• Elegant / Dainty jaw |
Compsognathidae | Germany & France | Late Jurassic (~150 Ma) | ~0.3 m (1 ft) | ~1 m (3.3 ft) | ~1–3.5 kg (2.2–7.7 lbs) | Carnivore / Insectivore | Solnhofen Limestone | Johann A. Wagner (1859) |
| Proceratosaurus bradleyi
• Before Ceratosaurus |
Proceratosauridae | Gloucestershire, England | Middle Jurassic (~166 Ma) | ~1 m (3.3 ft) | ~3 m (10 ft) | ~40 kg (88 lbs) | Carnivore | Great Oolite Group | Arthur Smith Woodward (1910) |
| Yutyrannus huali
• Feathered tyrant with beautiful crest |
Proceratosauridae | Liaoning, China | Early Cretaceous (~125 Ma) | ~3 m (10 ft) | ~9 m (30 ft) | ~1,400 kg (1.5 tons) | Carnivore | Yixian Formation | Xu Xing et al. (2012) |
| Archaeornithomimus asiaticus
• Ancient bird mimic from Asia |
Ornithomimidae | Inner Mongolia, China | Late Cretaceous (~96–70 Ma) | ~1.1 m (3.6 ft) | ~3.3 m (11 ft) | ~50–90 kg (110–200 lbs) | Omnivore / Herbivore | Iren Dabasu Formation | Dale Russell (1972) |
| Dromiceiomimus samueli
• Emu mimic of Samuel |
Ornithomimidae | Alberta, Canada | Late Cretaceous (~73 Ma) | ~1.2 m (4 ft) | ~3.5 m (11.5 ft) | ~100–150 kg (220–330 lbs) | Omnivore / Herbivore | Dinosaur Park Formation | Dale Russell (1972) |
| Gallimimus bullatus
• Chicken mimic with a capsule |
Ornithomimidae | Mongolia | Late Cretaceous (~70 Ma) | ~2 m (6.6 ft) | ~6 m (20 ft) | ~440 kg (970 lbs) | Herbivore / Omnivore | Nemegt Formation | Rinchen Barsbold et al. (1972) |
| Ornithomimus velox
• Swift bird mimic |
Ornithomimidae | Colorado & Montana, USA | Late Cretaceous (~68–66 Ma) | ~1.5 m (5 ft) | ~3.8 m (12.5 ft) | ~170 kg (370 lbs) | Herbivore / Omnivore | Denver Formation | Othniel Charles Marsh (1890) |
| Struthiomimus altus
• Ostrich mimic (Tall) |
Ornithomimidae | Alberta, Canada | Late Cretaceous (~76–74 Ma) | ~1.4 m (4.6 ft) | ~4.3 m (14 ft) | ~150 kg (330 lbs) | Herbivore / Omnivore | Dinosaur Park Formation | Lawrence Lambe (1902) |
| Deinocheirus mirificus
• Terrible hand / Unusual horrible hand |
Deinocheiridae | Mongolia | Late Cretaceous (~70 Ma) | ~6 m (19.7 ft) | ~16.5 m (52 ft) | ~6,400 kg (7 tons) | Omnivore (Plants & Fish) | Nemegt Formation | Halszka Osmólska et al. (1970) |
| Chirostenotes pergracilis
• Narrow hand / Very graceful hand |
Oviraptoridae | Alberta, Canada | Late Cretaceous (~76.5 Ma) | ~1 m (3.3 ft) | ~2.5 m (8 ft) | ~70–100 kg (150–220 lbs) | Omnivore | Dinosaur Park Formation | Lawrence Lambe (1924) |
| Oviraptor philoceratops
• Egg thief with a liking for ceratopsians |
Oviraptoridae | Gobi Desert, Mongolia | Late Cretaceous (~75 Ma) | ~0.8 m (2.6 ft) | ~1.6 m (5.2 ft) | ~35–40 kg (77–88 lbs) | Omnivore | Djadochta Formation | Henry Fairfield Osborn (1924) |
| Troodon formosus
• Wounding tooth (Beautiful) |
Saurornithoididae / Troodontidae | Montana, USA | Late Cretaceous (~77–75 Ma) | ~1 m (3.3 ft) | ~2.5 m (8 ft) | ~50 kg (110 lbs) | Omnivore / Carnivore | Two Medicine Formation | Joseph Leidy (1856) / Varricchio et al. (2025) |
| Therizinosaurus cheloniformis
• Scythe lizard shaped like a turtle |
Therizinosauridae | Gobi Desert, Mongolia | Late Cretaceous (~70 Ma) | ~4–5 m (13–16 ft) | ~9–10 m (30–33 ft) | ~5,000 kg (5.5 tons) | Herbivore | Nemegt Formation | Evgeny Maleev (1954) |
Suborder: Theropoda | Infraorder: Deinonychosauria
| Name Meaning | Clade / Family | Location | Temporal Range | Height | Length | Mass | Diet | Formation | Author / Discoverer |
|---|---|---|---|---|---|---|---|---|---|
| Atrociraptor marshalli
• Savage robber of Marshall |
Dromaeosauridae | Alberta, Canada | Late Cretaceous (~68.5 Ma) | ~0.8 m (2.6 ft) | ~2 m (6.6 ft) | ~15 kg (33 lbs) | Carnivore | Horseshoe Canyon Formation | Philip J. Currie & Varricchio (2004) |
| Deinonychus antirrhopus
• Terrible claw / Counterbalancing |
Dromaeosauridae | Montana, Wyoming, & Oklahoma, USA | Early Cretaceous (~115–108 Ma) | ~1 m (3.3 ft) | ~3.4 m (11 ft) | ~73–100 kg (160–220 lbs) | Carnivore | Cloverly Formation / Antlers Formation | John Ostrom (1969) |
| Hesperonychus elizabethae
• Western claw of Elizabeth |
Dromaeosauridae | Alberta, Canada | Late Cretaceous (~76.5 Ma) | ~0.2 m (0.7 ft) | ~1 m (3.3 ft) | ~1.9 kg (4.2 lbs) | Carnivore / Insectivore | Dinosaur Park Formation | Nicholas Longrich & Currie (2009) |
| Pyroraptor olympius
• Fire robber of Mount Olympus |
Dromaeosauridae | Provence, France | Late Cretaceous (~70.6 Ma) | ~0.6 m (2 ft) | ~1.6 m (5.2 ft) | ~30 kg (66 lbs) | Carnivore | Argiles Rutilantes Formation | Allain & Taquet (2000) |
| Saurornitholestes sullivani
• Lizard-bird thief of Sullivan |
Dromaeosauridae | New Mexico, USA | Late Cretaceous (~73 Ma) | ~0.8 m (2.6 ft) | ~1.8 m (6 ft) | ~10 kg (22 lbs) | Carnivore (Keen sense of smell) | Kirtland Formation | Steven E. Jasinski (2015) |
| Utahraptor ostrommaysi
• Utah robber of Ostrom & Mays |
Dromaeosauridae | Utah, USA | Early Cretaceous (~135–130 Ma) | ~1.8–2 m (6–6.6 ft) | ~5.5–6 m (18–20 ft) | ~300–500 kg (Up to 1,100 lbs) | Apex Carnivore | Cedar Mountain Formation | Kirkland, Gaston, & Burge (1993) |
| Velociraptor osmolskae
• Swift robber of Osmólska |
Dromaeosauridae | Inner Mongolia, China | Late Cretaceous (~75–71 Ma) | ~0.5 m (1.6 ft) | ~2 m (6.6 ft) | ~15 kg (33 lbs) | Carnivore | Bayan Mandahu Formation | Pascal Godefroit et al. (2008) |
| Archaeopteryx albersdoerferi
• Ancient wing of Albersdoerfer |
Archaeopterygidae | Bavaria, Germany | Late Jurassic (~149.6 Ma) | ~0.3 m (1 ft) | ~0.5 m (1.6 ft) | ~0.5–1 kg | Carnivore / Insectivore | Mörnsheim Formation | Kundrát et al. (2018) |
| Alexornis antecedens
• Alex's ancestral bird |
Alexornithidae (Enantiornithes) | Baja California, Mexico | Late Cretaceous (~73 Ma) | ~0.1 m (0.3 ft) | ~0.15 m (0.5 ft) | ~35 g (1.2 oz) | Insectivore | La Bocana Roja Formation | Pierce Brodkorb (1976) |
Suborder: Sauropodomorpha | Infraorder: Prosauropoda
| Name Meaning | Clade / Family | Location | Temporal Range | Height | Length | Mass | Diet | Formation | Author / Discoverer |
|---|---|---|---|---|---|---|---|---|---|
| Herrerasaurus ischigualastensis
• Herrera's lizard from Ischigualasto |
Herrerasauridae | San Juan, Argentina | Late Triassic (~231–228 Ma) | ~1.5 m (5 ft) | ~6 m (20 ft) | ~350 kg (770 lbs) | Carnivore | Ischigualasto Formation | Victorino Herrera / Osvaldo Reig (1963) |
| Anchisaurus polyzelus
• Near lizard (much sought after) |
Anchisauridae | Connecticut & Massachusetts, USA | Early Jurassic (~195 Ma) | ~0.6 m (2 ft) | ~2 m (6.6 ft) | ~27 kg (60 lbs) | Herbivore / Omnivore | Portland Formation | Edward Hitchcock (1865) / Marsh (1885) |
| Efraasia minor
• Eberhard Fraas's minor lizard |
Anchisauridae | Baden-Württemberg, Germany | Late Triassic (~210 Ma) | ~0.6 m (2 ft) | ~2–3 m (6.6–10 ft) | ~20–50 kg (44–110 lbs) | Herbivore / Omnivore | Löwenstein Formation | Friedrich von Huene (1908) |
| Smurfette smurfiness
• A fictional blue trap by Gargamel |
Anchisauridae | Smurf Village / Belgium | 1958 CE – Present | ~3 apples high | N/A | Negligible | Smurfberries | Peyo Studios | Pierre Culliford ("Peyo") (1958) |
| Thecodontosaurus antiquus
• Ancient socket-toothed lizard |
Anchisauridae | Bristol, England | Late Triassic (~205 Ma) | ~0.3 m (1 ft) | ~1.2–2 m (4–6.6 ft) | ~11 kg (24 lbs) | Herbivore | Magnesian Conglomerate | Henry Riley & Samuel Stutchbury (1836) |
| Massospondylus kaalae
• Elongated vertebra of Kaala |
Plateosauridae | Eastern Cape, South Africa | Early Jurassic (~200–183 Ma) | ~1.5 m (5 ft) | ~4–6 m (13–20 ft) | ~400–500 kg | Herbivore | Upper Elliot Formation | Paul M. Barrett (2009) |
| Plateosaurus gracilis
• Slender broad lizard |
Plateosauridae | Stuttgart, Germany | Late Triassic (~210 Ma) | ~1.5 m (5 ft) | ~4.5–5 m (15–16 ft) | ~600 kg (1,300 lbs) | Herbivore | Löwenstein Formation | Friedrich von Huene (1905) |
| Riojasaurus incertus
• Uncertain La Rioja lizard |
Melanorosauridae | La Rioja Province, Argentina | Late Triassic (~221–210 Ma) | ~2.5 m (8 ft) | ~6.6–10 m (22–33 ft) | ~800–1,500 kg | Herbivore | Los Colorados Formation | José Bonaparte (1969) |
Suborder: Sauropodomorpha | Infraorder: Sauropoda
| Name Meaning | Clade / Family | Location | Temporal Range | Height | Length | Mass | Diet | Formation | Author / Discoverer |
|---|---|---|---|---|---|---|---|---|---|
| Barapasaurus tagorei
• Big-legged lizard of Tagore |
Cetiosauridae | Telangana, India | Early Jurassic (~182 Ma) | ~5.5 m (18 ft) | ~14 m (46 ft) | ~7,000 kg (7.7 tons) | Herbivore | Kota Formation | Jain, Kutty, Roy-Chowdhury, & Chatterjee (1975) |
| Brachiosaurus altithorax
• Arm lizard with a deep chest |
Brachiosauridae | Colorado & Utah, USA; Telangana, India | Late Jurassic (~154–150 Ma) | ~12–15 m (40–49.2 ft) | ~24 m (79 ft) | ~35,000–56,000 kg | Herbivore | Morrison; Kota Formation | Elmer S. Riggs (1903) |
| Sauroposeidon proteles
• Lizard earthquake god, perfect before the end |
Brachiosauridae | Oklahoma & Texas, USA | Early Cretaceous (~112 Ma) | ~16–18 m (52–60 ft) | ~28–34 m (92–111 ft) | ~40,000–60,000 kg | Herbivore | Antlers Formation | Mathew Wedel, Cifelli, & Sanders (2000) |
| Camarasaurus supremus
• Chambered lizard (Supreme) |
Camarasauridae | Colorado, USA | Late Jurassic (~155–145 Ma) | ~7 m (23 ft) | ~15–23 m (50–75 ft) | ~20,000–47,000 kg | Herbivore | Morrison Formation | Edward Drinker Cope (1877) |
| Euhelopus zdanskyi
• True marsh foot of Zdansky |
Camarasauridae | Shandong, China | Early Cretaceous (~129–113 Ma) | ~4.5 m (15 ft) | ~11–15 m (36–49 ft) | ~3,500–4,000 kg | Herbivore | Mengyin Formation | Carl Wiman (1929) |
| Opisthocoelicaudia skarzynskii
• Posterior cavity tail of Skarżyńska |
Camarasauridae | Gobi Desert, Mongolia | Late Cretaceous (~70 Ma) | ~4 m (13 ft) | ~11.5–13 m (38–43 ft) | ~8,500–10,500 kg | Herbivore | Nemegt Formation | Maria Magdalena Borsuk-Białynicka (1977) |
| Apatosaurus ajax
• Deceptive lizard (Ajax) |
Diplodocidae | Colorado & Utah, USA | Late Jurassic (~152–151 Ma) | ~6.7 m (22 ft) | ~21–27 m (69–88 ft) | ~20,000–32,000 kg | Herbivore | Morrison Formation | Othniel Charles Marsh (1877) |
| Diplodocus hallorum
• Double-beam of the Hall family |
Diplodocidae | New Mexico, USA | Late Jurassic (~154–152 Ma) | ~5 m (16 ft) | ~29–33 m (95–108 ft) | ~13,000–15,000 kg | Herbivore | Morrison Formation | David Gillette (1991) |
| Mamenchisaurus sinocanadorum
• Mamenchi lizard of Sino-Canadian cooperation |
Diplodocidae | Xinjiang, China | Late Jurassic (~160–158 Ma) | ~16 m (52.4 ft) | ~26–35 m (85–115 ft) | ~25,000–60,000 kg | Herbivore | Shishugou Formation | Russell & Zheng (1993) / Moore et al. (2023) |
| Supersaurus vivianae
• Super lizard of Vivian |
Diplodocidae | Colorado & Wyoming, USA | Late Jurassic (~153 Ma) | ~21.5 m (70.5 ft) | ~39–50 m (128–160 ft) | ~35,000–40,000 kg | Herbivore | Morrison Formation | James A. Jensen (1985) |
| Dreadnoughtus schrani
• Fears nothing (of Adam Schran) |
Titanosauridae | Santa Cruz, Argentina | Late Cretaceous (~77 Ma) | ~18.7 m (61.4 ft) | ~26 m (85 ft) | ~49,000–59,000 kg | Herbivore | Cerro Fortaleza Formation | Kenneth Lacovara (2014) |
| Patagotitan mayorum
• Patagonian titan of the Mayo family |
Titanosauridae | Chubut, Argentina | Late Cretaceous (~101 Ma) | ~12 m (40 ft) | ~37 m (121 ft) | ~55,000–70,000 kg | Herbivore | Cerro Barcino Formation | Carballido et al. (2017) |
| Saltasaurus loricatus
• Lizard from Salta (Armored) |
Titanosauridae | Salta Province, Argentina | Late Cretaceous (~70–66 Ma) | ~2.5 m (8 ft) | ~8.5 m (28 ft) | ~2,500 kg (2.8 tons) | Herbivore | Lecho Formation | José Bonaparte & Powell (1980) |
Ornithischia
Suborder: Cerapoda | Infraorder: Ornithopoda
| Name Meaning | Clade / Family | Location | Temporal Range | Height | Length | Mass | Diet | Formation | Author / Discoverer |
|---|---|---|---|---|---|---|---|---|---|
| Lesothosaurus diagnosticus
• Lesotho lizard (diagnostic) |
Fabrosauridae / Basal Ornithischian | Lesotho & South Africa | Early Jurassic (~200–190 Ma) | ~0.4 m (1.3 ft) | ~2 m (6.6 ft) | ~6–8 kg (13–18 lbs) | Herbivore / Omnivore | Upper Elliot Formation | Peter Galton (1978) |
| Scutellosaurus lawleri
• Little-shielded lizard of Lawler |
Fabrosauridae / Basal Thyreophora | Arizona, USA | Early Jurassic (~196 Ma) | ~0.3 m (1 ft) | ~1.2–1.5 m (4–5 ft) | ~3–10 kg (6.6–22 lbs) | Herbivore | Kayenta Formation | Edwin Harris Colbert (1981) |
| Echinodon becklesii
• Prickly tooth of Beckles |
Heterodontosauridae | Dorset, England | Early Cretaceous (~140 Ma) | ~0.2 m (0.7 ft) | ~0.6 m (2 ft) | ~0.5–1 kg (1–2 lbs) | Omnivore | Purbeck Group | Sir Richard Owen (1861) |
| Heterodontosaurus tucki
• Different-toothed lizard of Tuck |
Heterodontosauridae | Cape Province, South Africa | Early Jurassic (~200–190 Ma) | ~0.5 m (1.6 ft) | ~1.2–1.75 m (4–5.7 ft) | ~2–10 kg (4.4–22 lbs) | Omnivore / Herbivore | Upper Elliot Formation | Alan Charig & Alfred Crompton (1962) |
| Dryosaurus elderae
• Oak lizard of Ann Elder |
Hysilophodontidae / Dryosauridae | Utah & Colorado, USA | Late Jurassic (~155–145 Ma) | ~1 m (3.3 ft) | ~2.5–4.3 m (8–14 ft) | ~70–100 kg | Herbivore | Morrison Formation | Kenneth Carpenter & Peter Galton (2018) |
| Hypsilophodon foxii
• High-crested tooth of Fox |
Hypsilophodontidae | Isle of Wight, England | Early Cretaceous (~130–125 Ma) | ~0.6 m (2 ft) | ~1.8 m (6 ft) | ~20 kg (44 lbs) | Herbivore | Wessex Formation | Thomas Henry Huxley (1869) |
| Parksosaurus warreni
• Parks' lizard of Warren |
Hypsilophodontidae / Thescelosauridae | Alberta, Canada | Late Cretaceous (~70 Ma) | ~1 m (3.3 ft) | ~2.5 m (8 ft) | ~45–50 kg (100–110 lbs) | Herbivore | Horseshoe Canyon Formation | William Parks (1926) / Loris Russell (1937) |
| Tenontosaurus dossi
• Sinew lizard of Doss |
Hypsilophodontidae / Iguanodontia | Texas, USA | Early Cretaceous (~113 Ma) | ~2 m (6.6 ft) | ~6–7 m (20–23 ft) | ~600–1,000 kg | Herbivore | Twin Mountains Formation | Winkler, Murry, & Tomida (1997) |
| Thescelosaurus garbanii
• Wonderful lizard of Garbani |
Hypsilophodontidae / Thescelosauridae | Montana, USA | Late Cretaceous (~67–66 Ma) | ~1.2 m (4 ft) | ~4–4.5 m (13–15 ft) | ~200–300 kg | Herbivore / Omnivore | Hell Creek Formation | William J. Morris (1976) |
Suborder: Cerapoda | Infraorder: Ornithopoda
| Name Meaning | Clade / Family | Location | Temporal Range | Height | Length | Mass | Diet | Formation | Author / Discoverer |
|---|---|---|---|---|---|---|---|---|---|
| Camptosaurus dispar
• Flexible / Bent lizard (Different) |
Iguanodontidae / Camptosauridae | Wyoming & Utah, USA | Late Jurassic (~156–146 Ma) | ~2 m (6.6 ft) | ~6 m (20 ft) | ~800–1,000 kg | Herbivore | Morrison Formation | Othniel Charles Marsh (1879) |
| Iguanodon bernissartensis
• Iguana tooth from Bernissart |
Iguanodontidae | Belgium, Germany, & UK | Early Cretaceous (~126–122 Ma) | ~4 m (13 ft) | ~10–13 m (33–43 ft) | ~4,000–5,000 kg | Herbivore | Sainte-Barbe Clays Formation | Louis Dollo (1882) |
| Muttaburrasaurus langdoni
• Muttaburra lizard of Langdon |
Iguanodontidae / Rhabdodontomorpha | Queensland, Australia | Early Cretaceous (~105–103 Ma) | ~2.5 m (8 ft) | ~7–8 m (23–26 ft) | ~2,800 kg (3 tons) | Herbivore | Mackunda Formation | Bartholomew & Molnar (1981) |
| Ouranosaurus nigeriensis
• Brave / Courageous lizard from Niger |
Iguanodontidae / Basal Hadrosauroidea | Agadez, Niger | Early Cretaceous (~112 Ma) | ~3 m (10 ft) | ~7–8.3 m (23–27 ft) | ~2,200 kg (2.4 tons) | Herbivore | Elrhaz Formation | Philippe Taquet (1976) |
| Corythosaurus casuarius
• Helmet lizard (Cassowary-like) |
Hadrosauridae (Lambeosaurinae) | Alberta, Canada; Wyoming, USA | Late Cretaceous (~77–75 Ma) | ~3–4 m (10–13 ft) | ~8.1–9 m (26–30 ft) | ~3,000–4,000 kg | Herbivore | Dinosaur Park; Lance Formation | Barnum Brown (1914) |
| Edmontosaurus regalis
• Edmonton lizard (Regal / King) |
Hadrosauridae (Hadrosaurinae) | Alberta, Canada; Wyoming, USA | Late Cretaceous (~73 Ma) | ~3.5 m (11.5 ft) | ~12–13 m (40–43 ft) | ~4,000–7,000 kg | Herbivore | Horseshoe Canyon; Lance Formation | Lawrence Lambe (1917) |
| Lambeosaurus magnicristatus
• Lambe's lizard with a large crest |
Hadrosauridae (Lambeosaurinae) | Alberta, Canada | Late Cretaceous (~75 Ma) | ~3.5 m (11.5 ft) | ~9.5 m (31 ft) | ~3,300 kg (3.6 tons) | Herbivore | Dinosaur Park Formation | Charles M. Sternberg (1935) |
| Maiasaura peeblesorum
• Good mother lizard of the Peebles family |
Hadrosauridae (Hadrosaurinae) | Montana, USA | Late Cretaceous (~76.7 Ma) | ~2.5 m (8 ft) | ~9 m (30 ft) | ~2,500–3,000 kg | Herbivore | Two Medicine Formation | Jack Horner & Robert Makela (1979) |
| Parasaurolophus walkeri
• Near crested lizard of Walker |
Hadrosauridae (Lambeosaurinae) | Alberta, Canada; Utah, USA | Late Cretaceous (~76.5–74.5 Ma) | ~4.7 m (14.5 ft) | ~9.5–10 m (31–33 ft) | ~2,500–3,500 kg | Herbivore | Dinosaur Park Formation | William Parks (1922) |
| Saurolophus osborni
• Crested lizard of Osborn |
Hadrosauridae (Hadrosaurinae) | Alberta, Canada | Late Cretaceous (~70 Ma) | ~3.2 m (10.5 ft) | ~8.5–9.8 m (28–32 ft) | ~3,000 kg (3.3 tons) | Herbivore | Horseshoe Canyon Formation | Barnum Brown (1912) |
| Shantungosaurus giganteus
• Shandong lizard (Gigantic) |
Hadrosauridae (Hadrosaurinae) | Shandong, China | Late Cretaceous (~73 Ma) | ~5–6 m (16–19.7 ft) | ~15–16.6 m (49–54 ft) | ~13,000–16,000 kg | Herbivore | Wangshi Group | Hu Chengzhi (1973) |
| Tsintaosaurus spinorhinus
• Qingdao lizard with a spine nose |
Hadrosauridae (Lambeosaurinae) | Shandong, China | Late Cretaceous (~73 Ma) | ~3.5 m (11.5 ft) | ~8.3–10 m (27–33 ft) | ~3,000 kg (3.3 tons) | Herbivore | Jiangjunding Formation | C.C. Young (1958) |
Suborder: Cerapoda | Infraorder: Ceratopia
| Name Meaning | Clade / Family | Location | Temporal Range | Height | Length | Mass | Diet | Formation | Author / Discoverer |
|---|---|---|---|---|---|---|---|---|---|
| Dracorex hogwartsia
• Dragon king of Hogwarts |
Pachycephalosauridae | South Dakota, USA | Late Cretaceous (~66 Ma) | ~0.8 m (2.6 ft) | ~3 m (10 ft) | ~50 kg (110 lbs) | Herbivore / Omnivore | Hell Creek Formation | Bob Bakker et al. (2006) |
| Homalocephale calathocercos
• Even/Flat head with a basket-like tail |
Pachycephalosauridae | Gobi Desert, Mongolia | Late Cretaceous (~80–75 Ma) | ~0.4 m (1.3 ft) | ~1.8 m (6 ft) | ~40 kg (88 lbs) | Herbivore / Omnivore | Nemegt Formation | Halszka Osmólska & Maryańska (1974) |
| Pachycephalosaurus wyomingensis
• Thick-headed lizard of Wyoming |
Pachycephalosauridae | Wyoming, Montana, & South Dakota, USA | Late Cretaceous (~68–66 Ma) | ~1.5–1.8 m (5–6 ft) | ~4.5 m (15 ft) | ~450 kg (1,000 lbs) | Herbivore / Omnivore | Hell Creek Formation | Charles W. Gilmore (1931) / Brown & Schlaikjer (1943) |
| Prenocephale prenes
• Sloping head / Slanted forehead |
Pachycephalosauridae | Gobi Desert, Mongolia | Late Cretaceous (~70 Ma) | ~0.8 m (2.6 ft) | ~2.4 m (8 ft) | ~130 kg (285 lbs) | Herbivore / Omnivore | Nemegt Formation | Teresa Maryańska & Osmólska (1974) |
| Stygimoloch spinifer
• Thorny devil from the River Styx |
Pachycephalosauridae | Montana & Wyoming, USA | Late Cretaceous (~66 Ma) | ~1.2 m (4 ft) | ~3 m (10 ft) | ~80 kg (176 lbs) | Herbivore / Omnivore | Hell Creek Formation | Peter Galton & Hans-Dieter Sues (1983) / Wroblewski (2025) |
| Psittacosaurus meileyingensis
• Parrot lizard from Meileyingzi |
Psittacosauridae | Liaoning Province, China | Early Cretaceous (~125–120 Ma) | ~0.6 m (2 ft) | ~1–2 m (3.3–6.6 ft) | ~20–30 kg (44–66 lbs) | Herbivore / Omnivore | Jiufotang Formation | Paul Sereno et al. (1988) |
Suborder: Cerapoda | Infraorder: Ceratopia
| Name Meaning | Clade / Family | Location | Temporal Range | Height | Length | Mass | Diet | Formation | Author / Discoverer |
|---|---|---|---|---|---|---|---|---|---|
| Bagaceratops rozhdestvenskyi
• Small horned face of Rozhdestvensky |
Protoceratopidae | Gobi Desert, Mongolia | Late Cretaceous (~75–72 Ma) | ~0.5 m (1.6 ft) | ~1 m (3.3 ft) | ~22 kg (50 lbs) | Herbivore | Barun Goyot Formation | Teresa Maryańska & Osmólska (1975) |
| Leptoceratops gracilis
• Slender small-horned face |
Leptoceratopsidae | Alberta, Canada; Wyoming, USA | Late Cretaceous (~66 Ma) | ~0.8 m (2.6 ft) | ~2 m (6.6 ft) | ~100–150 kg | Herbivore | Scollard Formation / Hell Creek | Barnum Brown (1914) |
| Microceratus gobiensis
• Small horned one of the Gobi |
Protoceratopidae | Gobi Desert, Mongolia | Late Cretaceous (~90 Ma) | ~0.2 m (0.7 ft) | ~0.6 m (2 ft) | ~1.5–2 kg (3–4.4 lbs) | Herbivore | Bayan Shireh Formation | Bohlin (1953) / Mateus (2008) |
| Montanoceratops cerorhynchus
• Mountain horned face (Horned snout) |
Leptoceratopsidae | Montana, USA | Late Cretaceous (~70 Ma) | ~1 m (3.3 ft) | ~3 m (10 ft) | ~170 kg (375 lbs) | Herbivore | St. Mary River Formation | Barnum Brown (1942) / Sternberg (1951) |
| Protoceratops hellenikorhinus
• First horned face with a Greek nose |
Protoceratopidae | Inner Mongolia, China | Late Cretaceous (~75 Ma) | ~0.8 m (2.6 ft) | ~2–2.5 m (6.6–8 ft) | ~180 kg (400 lbs) | Herbivore | Bayan Mandahu Formation | Olivier Lambert et al. (2001) |
| Centrosaurus apertus
• Pointed lizard (Open/Uncovered) |
Ceratopsidae (Centrosaurinae) | Alberta, Canada | Late Cretaceous (~76.5–75.5 Ma) | ~2 m (6.6 ft) | ~5.5–6 m (18–20 ft) | ~2,300 kg (2.5 tons) | Herbivore | Dinosaur Park Formation | Lawrence Lambe (1904) |
| Chasmosaurus belli
• Chasm lizard of William Bell |
Ceratopsidae (Chasmosaurinae) | Alberta, Canada | Late Cretaceous (~76.5–76 Ma) | ~2 m (6.6 ft) | ~4.8–5 m (16 ft) | ~1,500–2,000 kg | Herbivore | Dinosaur Park Formation | Lawrence Lambe (1914) |
| Lokiceratops rangiformis
• Loki's horned face shaped like a caribou |
Ceratopsidae (Centrosaurinae) | Montana, USA | Late Cretaceous (~78 Ma) | ~2.3 m (7.5 ft) | ~6.7 m (22 ft) | ~5,000 kg (5.5 tons) | Herbivore | Judith River Formation | Loewen & Sertich (2024) |
| Nasutoceratops titusi
• Large-nosed horned face of Titus |
Ceratopsidae (Centrosaurinae) | Utah, USA | Late Cretaceous (~76 Ma) | ~2 m (6.6 ft) | ~4.5–5 m (15–16 ft) | ~1,500 kg (1.6 tons) | Herbivore | Kaiparowits Formation | Scott Sampson et al. (2013) |
| Pachyrhinosaurus lakustai
• Thick-nosed lizard of Al Lakusta |
Ceratopsidae (Centrosaurinae) | Alberta, Canada; Colorado, USA | Late Cretaceous (~73.5 Ma) | ~2.5 m (8 ft) | ~5 m (16 ft) | ~3,000 kg (3.3 tons) | Herbivore | Wapiti; Hell Creek Formation | Philip J. Currie et al. (2008) |
| Sinoceratops zhuchengensis
• Chinese horned face from Zhucheng |
Ceratopsidae (Centrosaurinae) | Shandong, China | Late Cretaceous (~73 Ma) | ~2.5 m (8 ft) | ~6 m (20 ft) | ~2,000–2,300 kg | Herbivore | Xingezhuang Formation | Xu Xing et al. (2010) |
| Styracosaurus ovatus
• Spiked lizard (Egg-shaped / Oval) |
Ceratopsidae (Centrosaurinae) | Montana, USA | Late Cretaceous (~75 Ma) | ~2 m (6.6 ft) | ~5–5.5 m (16–18 ft) | ~2,000 kg (2.2 tons) | Herbivore | Two Medicine Formation | Charles Gilmore (1930) / McDonald (2010) |
| Torosaurus latus
• Perforated / Perforating lizard (Wide) |
Ceratopsidae (Chasmosaurinae) | Western North America | Late Cretaceous (~68–66 Ma) | ~2.5–3 m (8–10 ft) | ~7.5–9 m (25–30 ft) | ~6,000 kg (6.6 tons) | Herbivore | Hell Creek Formation | Othniel Charles Marsh (1891) |
| Triceratops horridus
• Three-horned face (Horrid / Rough) |
Ceratopsidae (Chasmosaurinae) | Western North America | Late Cretaceous (~68–66 Ma) | ~2.8–3 m (9–10 ft) | ~8–9 m (26–30 ft) | ~6,000–12,000 kg | Herbivore | Hell Creek Formation | Othniel Charles Marsh (1889) |
Suborder: Thyreophora | Infraorder: Stegosauria
| Name Meaning | Clade / Family | Location | Temporal Range | Height | Length | Mass | Diet | Formation | Author / Discoverer |
|---|---|---|---|---|---|---|---|---|---|
| Chungkingosaurus jiangbeiensis
• Chongqing lizard from Jiangbei |
Stegosauridae | Chongqing, China | Late Jurassic (~160 Ma) | ~1.2 m (4 ft) | ~3–4 m (10–13 ft) | ~1,000 kg (1 ton) | Herbivore | Upper Shaximiao Formation | Dong Zhiming et al. (1983) |
| Gigantspinosaurus sichuanensis
• Giant spined lizard from Sichuan |
Stegosauridae | Sichuan, China | Late Jurassic (~160 Ma) | ~1.5 m (5 ft) | ~4.2 m (14 ft) | ~700 kg (1,500 lbs) | Herbivore | Upper Shaximiao Formation | Ouyang Hui (1992) |
| Kentrosaurus aethiopicus
• Spiked lizard from Africa |
Stegosauridae | Lindi Region, Tanzania | Late Jurassic (~154–150 Ma) | ~1.5 m (5 ft) | ~4.5 m (15 ft) | ~700–1,100 kg | Herbivore | Tendaguru Formation | Edwin Hennig (1915) |
| Stegosaurus stenops
• Roof lizard (Narrow-faced) |
Stegosauridae | Colorado, Utah, & Wyoming, USA | Late Jurassic (~155–150 Ma) | ~2.8–4 m (9–13 ft) | ~7–9 m (23–30 ft) | ~3,500–5,000 kg | Herbivore | Morrison Formation | Othniel Charles Marsh (1887) |
| Tuojiangosaurus multispinus
• Tuo River lizard with many spines |
Stegosauridae | Sichuan, China | Late Jurassic (~161–155 Ma) | ~2 m (6.6 ft) | ~7 m (23 ft) | ~2,800 kg (3 tons) | Herbivore | Upper Shaximiao Formation | Dong Zhiming et al. (1977) |
| Scelidosaurus harrisonii
• Limb lizard of James Harrison |
Scelidosauridae | Dorset, England | Early Jurassic (~191 Ma) | ~1 m (3.3 ft) | ~4 m (13 ft) | ~270 kg (600 lbs) | Herbivore | Charmouth Mudstone Formation | Sir Richard Owen (1859) |
Suborder: Thyreophora | Infraorder: Ankylosauria
| Name Meaning | Clade / Family | Location | Temporal Range | Height | Length | Mass | Diet | Formation | Author / Discoverer |
|---|---|---|---|---|---|---|---|---|---|
| Edmontonia rugosidens
• Edmonton town (Rugged tooth) |
Nodosauridae | Alberta, Canada | Late Cretaceous (~76–75 Ma) | ~1.6 m (5.2 ft) | ~6 m (20 ft) | ~3,000 kg (3.3 tons) | Herbivore | Dinosaur Park Formation | Charles M. Sternberg (1928) / Gilmore (1930) |
| Nodosaurus textilis
• Knobby lizard (Woven) |
Nodosauridae | Wyoming & Kansas, USA | Late Cretaceous (~99–93 Ma) | ~1.5 m (5 ft) | ~4–6 m (13–20 ft) | ~1,500–2,500 kg | Herbivore | Frontier Formation | Othniel Charles Marsh (1889) |
| Sauropelta edwardsorum
• Lizard shield of the Edwards family |
Nodosauridae | Montana & Wyoming, USA | Early Cretaceous (~108 Ma) | ~1.6 m (5.2 ft) | ~5.2 m (17 ft) | ~1,500 kg (1.6 tons) | Herbivore | Cloverly Formation | Barnum Brown (1914) / John Ostrom (1970) |
| Silvisaurus condrayi
• Forest lizard of Warren Condray |
Nodosauridae | Kansas, USA | Early Cretaceous (~100 Ma) | ~1 m (3.3 ft) | ~4 m (13 ft) | ~1,000 kg (1 ton) | Herbivore | Dakota Formation | Theodore H. Eaton Jr. (1960) |
| Ankylosaurus magniventris
• Fused lizard with a great belly |
Ankylosauridae | Western North America | Late Cretaceous (~68–66 Ma) | ~1.7–3.8 m (5.6–12.5 ft) | ~7.5–11 m (25–36 ft) | ~4,800–8,000 kg | Herbivore | Hell Creek Formation | Barnum Brown (1908) |
| Euoplocephalus tutus
• Well-armed head (Safely protected) |
Ankylosauridae | Alberta, Canada | Late Cretaceous (~76–75 Ma) | ~1.8 m (6 ft) | ~5.5–6 m (18–20 ft) | ~2,500 kg (2.7 tons) | Herbivore | Dinosaur Park Formation | Lawrence Lambe (1902) / (1910) |
| Minmi paravertebral
• From Minmi Crossing (with paravertebrae) |
Ankylosauridae / Basal Ankylosauria | Queensland, Australia | Early Cretaceous (~120–112 Ma) | ~1 m (3.3 ft) | ~2–3 m (6.6–10 ft) | ~300 kg (660 lbs) | Herbivore | Bungalbin Member (Minmi Member) | Ralph E. Molnar (1980) |
| Saichania chulsanensis
• Beautiful one from Chulsan |
Ankylosauridae | Gobi Desert, Mongolia | Late Cretaceous (~75–70 Ma) | ~2 m (6.6 ft) | ~5.2–6.6 m (17–22 ft) | ~2,000–3,000 kg | Herbivore | Barun Goyot Formation | Teresa Maryańska (1977) |
| Scolosaurus thronus
• Thorn-lizard from a high throne |
Ankylosauridae | Alberta, Canada | Late Cretaceous (~76.5 Ma) | ~1.5 m (5 ft) | ~5–6 m (16–20 ft) | ~2,000 kg (2.2 tons) | Herbivore | Dinosaur Park Formation | Barnum Brown (1912) / Nopcsa (1928) |
Pterosauria
Suborder: Rhamphorhynchoidea (Long-tailed Basal Pterosaurs)
| Name Meaning | Clade / Family | Location | Temporal Range | Height | Length (Body / Wingspan) | Mass | Diet | Formation | Author / Discoverer |
|---|---|---|---|---|---|---|---|---|---|
| Dimorphodon macronyx
• Two-form tooth (Large claw) |
Dimorphodontidae | Dorset, England | Early Jurassic (~195–190 Ma) | ~0.4 m (1.3 ft) | ~0.6 m body /
~1.45 m wingspan |
~1–2 kg (2.2–4.4 lbs) | Piscivore / Small Vertebrates | Blue Lias Formation | Mary Anning (1828) / Richard Owen (1859) |
| Dorygnathus banthensis
• Spear jaw from Banz |
Dimorphodontidae / Rhamphorhynchidae | Bavaria, Germany | Early Jurassic (~180 Ma) | ~0.25 m (0.8 ft) | ~0.4 m body /
~1.5 m wingspan |
~1.5 kg (3.3 lbs) | Piscivore | Posidonia Shale | Johann Andreas Wagner (1860) |
| Eudimorphodon ranzii
• True two-form tooth of Ranzi |
Eudimorphodontidae | Lombardy, Italy | Late Triassic (~210 Ma) | ~0.2 m (0.7 ft) | ~0.4 m body /
~1 m wingspan |
~100–300 g | Piscivore / Insectivore | Zorzino Limestone | Rocco Zambelli (1973) |
| Anurognathus ammoni
• Tailless / Frog jaw of Ammon |
Rhamphorhynchidae / Anurognathidae | Bavaria, Germany | Late Jurassic (~150 Ma) | ~0.05 m (0.15 ft) | ~0.09 m body /
~0.5 m wingspan |
~40 g (1.4 oz) | Insectivore | Solnhofen Limestone | Ludwig Döderlein (1923) |
| Rhamphorhynchus etchesi
• Beak snout of Steve Etches |
Rhamphorhynchidae | Dorset, England | Late Jurassic (~150 Ma) | ~0.2 m (0.7 ft) | ~0.4 m body /
~1.7 m wingspan |
~1 kg (2.2 lbs) | Piscivore | Kimmeridge Clay | Martill & O'Sullivan (2015) |
| Scaphognathus crassirostris
• Tub/Boat jaw (Thick snout) |
Rhamphorhynchidae | Bavaria, Germany | Late Jurassic (~150 Ma) | ~0.3 m (1 ft) | ~0.5 m body /
~0.9 m wingspan |
~400 g (0.9 lbs) | Piscivore / Generalist | Solnhofen Limestone | August Goldfuss (1831) |
| Sordes pilosus
• Hairy filth / Hairy devil |
Rhamphorhynchidae | Karatau, Kazakhstan | Late Jurassic (~155 Ma) | ~0.15 m (0.5 ft) | ~0.3 m body /
~0.6 m wingspan |
~200 g (7 oz) | Insectivore | Aulie Formation | Aleksandr Grigorevich Sharov (1971) |
Suborder: Pterodactyloidea (Advanced Short-tailed Pterosaurs)
| Name Meaning | Clade / Family | Location | Temporal Range | Height | Length (Body / Wingspan) | Mass | Diet | Formation | Author / Discoverer |
|---|---|---|---|---|---|---|---|---|---|
| Caiuajara dobruskii
• Caiuá ancient wizard of Dobruski |
Tapejaridae | Paraná, Brazil | Late Cretaceous (~85 Ma) | ~0.7 m (2.3 ft) | ~0.9 m body /
~2.35 m wingspan |
~3–5 kg (6.6–11 lbs) | Frugivore / Omnivore | Goio-Erê Formation | Paulo Manzig et al. (2014) |
| Cearadactylus atrox
• Ceará finger (Fierce / Cruel) |
Anhangueridae | Ceará, Brazil | Early Cretaceous (~112 Ma) | ~0.8 m (2.6 ft) | ~1.2 m body /
~4–5.5 m wingspan |
~15 kg (33 lbs) | Piscivore | Romualdo Formation | Leonardi & Borgomanero (1985) |
| Geosternbergia sternbergi
• George Sternberg's mountain wing |
Ornithocheiridae / Pteranodontidae | Kansas, USA | Late Cretaceous (~88–86 Ma) | ~1.5 m (5 ft) | ~2 m body /
~6–7.2 m wingspan |
~20–35 kg | Piscivore | Niobrara Chalk | George F. Sternberg (1952) / S. Christopher Bennett (1994) |
| Pteranodon longiceps
• Winged toothless one (Long head) |
Ornithocheiridae / Pteranodontidae | Kansas & Nebraska, USA | Late Cretaceous (~86–84 Ma) | ~1.8 m (6 ft) | ~2.2 m body /
~5.6–7 m wingspan |
~20–45 kg | Piscivore | Niobrara Chalk | Othniel Charles Marsh (1876) |
| Quetzalcoatlus lawsoni
• Quetzalcoatl god of Douglas Lawson |
Ornithocheiridae / Azhdarchidae | Texas, USA | Late Cretaceous (~68–66 Ma) | ~14.5 m (47.5 ft) | ~12.5 m body /
~4.5–25 m wingspan |
~40–50,000 kg | Carnivore / Generalist | Javelina Formation | Douglas Lawson (1975) / Brian Andres et al. (2021) |
| Pterodaustro guinazui
• Southern wing of Guiñazú |
Pterodaustriidae | San Luis, Argentina | Early Cretaceous (~105 Ma) | ~0.4 m (1.3 ft) | ~0.6 m body /
~2.5 m wingspan |
~2–3 kg (4.4–6.6 lbs) | Filter Feeder (Plankton/Crustaceans) | Lagarcito Formation | José Bonaparte (1969) |
Prehistoric Marine Predators & Squamates
| Name Meaning | Clade / Family / Order | Location | Temporal Range | Height / Depth | Length | Mass | Diet | Formation | Author / Discoverer |
|---|---|---|---|---|---|---|---|---|---|
| Otodus megalodon
• Giant tooth |
Otodontidae / Lamniformes | Global oceans | Miocene to Pliocene (~23–3.6 Ma) | ~2–3 m (Body depth) | ~15–20 m (50–65 ft) | ~50,000–60,000 kg | Marine Mammals (Whales) | Yorktown Formation / Bone Valley | Louis Agassiz (1843) |
| Dunkleosteus amblyodoratus
• Dunkle's bone (Blunt spear) |
Dunkleosteidae / Arthrodira | Ontario, Canada | Late Devonian (~372–360 Ma) | ~0.8 m (2.6 ft) | ~3 m (10 ft) | ~500–700 kg | Carnivore (Armored fish) | Kettle Point Formation | Robert Carr & James Hlavin (2010) |
| Ichthyosaurus conybeari
• Fish lizard of William Conybeare |
Ichthyosauridae / Ichthyosauria | England, UK | Early Jurassic (~200–190 Ma) | ~0.5 m (1.6 ft) | ~2–2.5 m (6.6–8 ft) | ~40–50 kg | Piscivore / Cephalopods | Blue Lias Formation | Lydekker (1888) |
| Eurhinosaurus huenei
• Well-nosed lizard of von Huene |
Leptonectidae / Ichthyosauria | Germany, France, & Switzerland | Early Jurassic (~180 Ma) | ~0.8 m (2.6 ft) | ~6 m (20 ft) | ~1,000 kg (1 ton) | Piscivore / Cephalopods | Posidonia Shale | Abel (1909) |
| Ophthalmosaurus icenicus
• Eye lizard of the Iceni tribe |
Ophthalmosauridae / Ichthyosauria | England, UK; France | Late Jurassic (~165–160 Ma) | ~1.2 m (4 ft) | ~6 m (20 ft) | ~3,000 kg (3.3 tons) | Cephalopods (Deep-sea squid) | Oxford Clay Formation | Harry Govier Seeley (1874) |
| Elasmosaurus platyurus
• Thin-plate lizard (Flat-tailed) |
Elasmosauridae / Plesiosauria | Kansas, USA | Late Cretaceous (~80.5 Ma) | ~1.5 m (5 ft) | ~10.3 m (34 ft) | ~2,000 kg (2.2 tons) | Piscivore / Cephalopods | Pierre Shale | Edward Drinker Cope (1868) |
| Plesiosaurus dolichodeirus
• Near to lizard (Long-necked) |
Plesiostauridae / Plesiosauria | Dorset, England | Early Jurassic (~199–191 Ma) | ~0.6 m (2 ft) | ~3.5 m (11.5 ft) | ~400 kg (880 lbs) | Piscivore | Blue Lias Formation | Mary Anning (1823) / Conybeare (1824) |
| Trinacromerum kirki
• Three-tipped femur of Kirk |
Polycotylidae / Plesiosauria | Kansas, USA | Late Cretaceous (~93 Ma) | ~0.5 m (1.6 ft) | ~3 m (10 ft) | ~200 kg (440 lbs) | High-speed Piscivore | Greenhorn Limestone | Charles M. Sternberg (1935) |
| Attenborosaurus conybeari
• David Attenborough's lizard |
Pliosauridae / Plesiosauria | Dorset, England | Early Jurassic (~190 Ma) | ~0.8 m (2.6 ft) | ~5 m (16.5 ft) | ~700 kg (1,500 lbs) | Piscivore | Blue Lias Formation | William J. Sollas (1881) / Bakker (1993) |
| Kronosaurus queenslandicus
• Lizard of Cronus from Queensland |
Pliosauridae / Plesiosauria | Queensland, Australia | Early Cretaceous (~120–110 Ma) | ~2.5 m (8 ft) | ~9–10.5 m (30–34 ft) | ~11,000 kg (12 tons) | Apex Carnivore | Toolebuc Formation | Heber Longman (1924) |
| Liopleurodon ferox
• Smooth-sided teeth (Ferocious) |
Pliosauridae / Plesiosauria | England & France | Late Jurassic (~166–155 Ma) | ~1.8 m (6 ft) | ~5–7 m (16–23 ft) | ~1,500–3,000 kg | Apex Carnivore | Oxford Clay Formation | Henri Émile Sauvage (1873) |
| Clidastes propython
• Locked vertebrae (Before the python) |
Mosasauridae / Squamata | Alabama & South Dakota, USA | Late Cretaceous (~82 Ma) | ~0.4 m (1.3 ft) | ~4 m (13 ft) | ~100–150 kg | Piscivore / Generalist | Mooreville Chalk | Edward Drinker Cope (1868) |
| Jormungandr walhallaensis
• Midgard Sea Serpent of Walhalla |
Mosasauridae / Squamata | North Dakota, USA | Late Cretaceous (~80 Ma) | ~0.6 m (2 ft) | ~7–7.3 m (24 ft) | ~1,200 kg | Generalist / Marine Life | Pierre Shale (Pembina Member) | Amelia Zietlow et al. (2023) |
| Mosasaurus beaugei
• Meuse River lizard of Beaugé |
Mosasauridae / Squamata | Oulad Abdoun Basin, Morocco | Late Cretaceous (~66 Ma) | ~4 m (13 ft) | ~10–18 m (33–60 ft) | ~5,000–8,000 kg | Apex Carnivore | Ouled Abdoun Basin | Camille Arambourg (1952) |
| Megalania priscus
• Ancient giant roamer |
Varanidae / Squamata | Queensland & NSW, Australia | Pleistocene (~2 Ma–40,000 YA) | ~1.2 m (4 ft) | ~5.5–7 m (18–23 ft) | ~600–1,900 kg | Terrestrial Megafauna Carnivore | Deep Creek / Various Alluvial deposits | Sir Richard Owen (1859) |
Synapsids, Non-Mammalian Therapsids, & Early Mammals
| Name Meaning | Clade / Family / Order | Location | Temporal Range | Height | Length | Mass | Diet | Formation | Author / Discoverer |
|---|---|---|---|---|---|---|---|---|---|
| Dimetrodon grandis
• Two measures of teeth (Grand) |
Sphenacodontidae / Pelycosauria | Texas & Oklahoma, USA | Early Permian (~280–270 Ma) | ~1.5 m (5 ft) (at sail tip) | ~3.5 m (11.5 ft) | ~250 kg (550 lbs) | Apex Carnivore | Arroyo Formation (Clear Fork Group) | Edward Drinker Cope (1878) |
| Lystrosaurus curvatus
• Shovel lizard (Curved) |
Lystrosauridae / Dicynodontia | South Africa, Antarctica, & India | Late Permian to Early Triassic (~252–251 Ma) | ~0.5 m (1.6 ft) | ~1 m (3.3 ft) | ~90 kg (200 lbs) | Herbivore (Roots/Tubers) | Balfour Formation (Katberg Basin) | Owen (1859) / Brink (1951) |
| Bulbasaurus phylloxyron
• Bulbous reptile (Leaf razor) |
Geikiidae / Dicynodontia | Western Cape, South Africa | Late Permian (~259–254 Ma) | ~0.25 m (0.8 ft) | ~0.6 m (2 ft) | ~5–10 kg (11–22 lbs) | Herbivore | Tropidostoma Assemblage Zone | Kammerer & Smith (2017) |
| Alphadon halleyi
• First tooth of Halley |
Alphadontidae / Metatheria | Montana, USA; Alberta, Canada | Late Cretaceous (~76–75 Ma) | ~0.1 m (0.3 ft) | ~0.3 m (12 in) | ~300 g (12 oz) | Omnivore (Insects/Fruit) | Judith River Formation | Ashok Sahni (1972) |
Dinosaur Facts and Figures
Early Theropoda Scientific Catalog
| Taxon & Specimen | Age & Time Period | Dimensions (Hip Height, Length, Mass) | Location Formation | Teodora Villavicencio's Comments (Legend Quest: Master of Myth) (VO: Annemarie Blanco) |
| Herrerasaurus ischigualastensis (Holotype: PVL 2566) | Late Triassic (Carnian, ~231.4 Ma) | Height: ~0.5 m
Length: ~3.0–6.0 m Mass: ~200–350 kg |
Formation: Ischigualasto Formation, Argentina | "Ale, look at those flexible lower jaw joints! This hyper-carnivorous basal beast shows that early predators were already mastering primitive kinetic skulls long before the Jurassic giants ever walked the valley." |
| Staurikosaurus pricei (Holotype: MCZ 4139) | Late Triassic (Carnian, ~233.2 Ma) | Height: ~0.8 m
Length: ~2.25 m Mass: ~30 kg |
Formation: Santa Maria Formation, Brazil | "Such a slender, agile hunter! Its short body and long tail tell me it relied entirely on quick, bounding strikes rather than brute force to catch prey in those ancient floodplains." |
| Abelisaurus comahuensis (Holotype: MCV 878) | Late Cretaceous (Campanian, ~80 Ma) | Height: ~2.5 m
Length: ~7.0–9.0 m Mass: ~1.4–2.0 metric tons |
Formation: Allen Formation, Argentina | "Look at the rugged skull ornamentation without horns! Even though we are missing most of its skeleton, its skull geometry screams specialized apex ambush predator." |
| Carnotaurus sastrei (Holotype: MACN-CH 894) | Late Cretaceous (Campanian–Maastrichtian, ~72 Ma) | Height: ~3.0 m
Length: ~7.5–8.0 m Mass: ~1.3–2.1 metric tons |
Formation: La Colonia Formation, Argentina | "The meat-eating bull with actual horns! And those ridiculously stubby arms make my archaeological tools look oversized. Still, its rigid, deep snout was built for high-speed slash-and-grab attacks!" |
| Ceratosaurus nasicornis (Holotype: USNM 4735) | Late Jurassic (Kimmeridgian–Tithonian, ~152 Ma) | Height: ~1.8 m
Length: ~5.3–7.0 m Mass: ~500–980 kg |
Formation: Morrison Formation, USA | "That prominent nasal horn and the osteoderms running down its back give it such a striking, dragon-like silhouette. A true classic of the Late Jurassic predator guild!" |
| Coelophysis bauri (Lectotype: AMNH 7224) | Late Triassic (Norian, ~208–201 Ma) | Height: ~0.5 m
Length: ~3.0 m Mass: ~15–25 kg |
Formation: Chinle Formation, USA | "Swarming bonebeds like Ghost Ranch prove these slender coelophysids hunted in packs! Those razor-sharp, serrated teeth were engineered for lightning-fast insect and small vertebrate snags." |
| Dilophosaurus wetherilli (Holotype: UCMP 37302) | Early Jurassic (Sinemurian, ~193 Ma) | Height: ~1.7 m
Length: ~6.0–7.0 m Mass: ~400 kg |
Formation: Kayenta Formation, USA | "Forget the fictional movie spitting venom—this crested apex predator of the Early Jurassic had a delicate, notched upper jaw that hints it might have specialized in fish or smaller, agile prey!" |
| Liliensternus liliensterni (Lectotype: MB.R.2175) | Late Triassic (Norian, ~210–201 Ma) | Height: ~1.0 m
Length: ~5.15 m Mass: ~127 kg |
Formation: Trossingen Formation, Germany | "A magnificent European basal neotheropod! Its pneumatic vertebrae and hollow limb bones show just how early evolutionary experimentation with lightweight, agile frames began." |
| Majungasaurus crenatissimus (Holotype: MNHN 1931-3) | Late Cretaceous (Maastrichtian, ~70–66 Ma) | Height: ~2.1 m
Length: ~6.0–8.0 m Mass: ~1.1 metric tons |
Formation: Maevarano Formation, Madagascar | "Cannibalism confirmed through deep tooth marks on its own kind! This short-snouted, dome-headed abelisaurid proves that Late Cretaceous island ecosystems were utterly brutal." |
Tetanurae Scientific Catalog
| Taxon & Specimen | Age & Time Period | Dimensions (Hip Height, Length, Mass) | Location Formation | Teodora Villavicencio's Comments (Legend Quest: Master of Myth) (VO: Annemarie Blanco) |
| Eustreptospondylus oxoniensis
(Holotype: OUMNH J.13558) |
Middle Jurassic (Callovian, ~165 Ma) | Height: ~1.5 m
Length: ~4.6–6.0 m Mass: ~200–300 kg |
Formation: Oxford Clay Formation, England | "A classic coastal dweller! Finding its lone skeleton washed up in marine clays suggests this megalosaurid might have scavenged along ancient shorelines or floated out to sea." |
| Marshosaurus bicentesimus
(Holotype: UU VP 6389) |
Late Jurassic (Kimmeridgian, ~155 Ma) | Height: ~1.0 m
Length: ~5.0–6.0 m Mass: ~140–200 kg |
Formation: Morrison Formation, USA | "Named in honor of Othniel Charles Marsh during the American bicentennial, this slender middle-tier predator quietly shared the Morrison landscape with giants like Allosaurus." |
| Metriacanthosaurus parkeri
(Holotype: OUMNH J.12144) |
Late Jurassic (Oxfordian, ~160 Ma) | Height: ~2.0 m
Length: ~8.0 m Mass: ~1.0 metric ton |
Formation: Oxford Clay Formation, England | "Look at those unusually tall neural spines on its back! They aren't quite a full sail like Spinosaurus, but they definitely gave it a striking, high-backed profile in the Jurassic mist." |
| Cryolophosaurus ellioti
(Holotype: FMNH PR1821) |
Early Jurassic (Pliensbachian, ~194 Ma) | Height: ~2.0 m
Length: ~6.5 m Mass: ~465 kg |
Formation: Hanson Formation, Antarctica | "The frozen crest of Antarctica! Finding a carnivorous theropod with a bizarre, transverse 'Elvis pompadour' crest right near the South Pole proves these dinosaurs adapted to polar darkness and seasonal chill." |
| Poekilopleuron bucklandii
(Holotype: Destroyed in WWII) |
Middle Jurassic (Bathonian, ~167 Ma) | Height: ~1.5 m
Length: ~6.0 m Mass: ~300–400 kg |
Formation: Marnes de Dives Formation, France | "One of the earliest named French dinosaurs! Even though the original holotype was lost to history during World War II, its legacy in early tetanuran taxonomy remains monumental." |
| Torvosaurus gurneyi
(Holotype: ML 1100) |
Late Jurassic (Kimmeridgian–Tithonian, ~150 Ma) | Height: ~2.5 m
Length: ~10.0 m Mass: ~2.0 metric tons |
Formation: Lourinhã Formation, Portugal | "The savage lion of Late Jurassic Europe! Its immensely thick teeth and massive arms meant it could easily contest kills with anything else roaming the Iberian floodplains." |
| Acrocanthosaurus atokensis
(Holotype: SMU 74677) |
Early Cretaceous (Aptian–Albian, ~113–110 Ma) | Height: ~3.0 m
Length: ~11.5 m Mass: ~5.6–6.2 metric tons |
Formation: Antlers Formation, USA | "That muscular ridge running down its spine wasn't a fragile sail—it anchored powerful muscle sheets for a devastating strike. A true apex terror of the early Cretaceous!" |
| Carcharodontosaurus iguidensis
(Holotype: MNHN GDF 512) |
Late Cretaceous (Cenomanian, ~95 Ma) | Height: ~3.5 m
Length: ~10.0–12.0 m Mass: ~4.0 metric tons |
Formation: Echkar Formation, Niger | "Shark-toothed terror of the Sahara! Those serrated blades were custom-built to slice deep chunks of flesh out of massive titanosaur prey in North African river systems." |
| Giganotosaurus carolinii
(Holotype: MUCPv-Ch1) |
Late Cretaceous (Cenomanian, ~97–96 Ma) | Height: ~3.7 m
Length: ~12.2–13.2 m Mass: ~6.5–8.0 metric tons |
Formation: Candeleros Formation, Argentina | "Bigger than T. rex by length, with a skull built like an absolute crushing machine. South America's supreme apex predator was a masterpiece of specialized carnivory!" |
| Allosaurus europaeus
(Holotype: ML 415) |
Late Jurassic (Kimmeridgian, ~152 Ma) | Height: ~2.9 m
Length: ~12.0 m Mass: ~4.5 metric tons |
Formation: Lourinhã Formation, Portugal / Morrison Formation, USA | "The European cousin of the classic American Allosaurus! Proving that this genus was a wildly successful trans-Atlantic hunter across varied Jurassic archipelagos." |
| Yangchuanosaurus zigongensis
(Holotype: CV 00101) |
Middle to Late Jurassic (Callovian–Oxfordian, ~165 Ma) | Height: ~2.2 m
Length: ~8.0–11.0 m Mass: ~2.4 metric tons |
Formation: Shaximiao Formation, China | "Asia's answer to Allosaurus! With a rugged nose horn and a heavily armored skull structure, it dominated the lush Jurassic ecosystems of Sichuan province." |
| Baryonyx walkeri
(Holotype: NHMUK VP R9951) |
Early Cretaceous (Barremian, ~125 Ma) | Height: ~2.0 m
Length: ~7.5–8.5 m Mass: ~1.2–1.7 metric tons |
Formation: Weald Clay Group, England | "That enormous, sickle-shaped thumb claw and crocodile-like snout make it unmistakably piscivorous. Scales of fossilized fish inside its ribcage give us a direct window into its diet!" |
| Spinosaurus aegyptiacus
(Neotype: FSAC-CK 114) |
Late Cretaceous (Cenomanian, ~95–93 Ma) | Height: ~4.0 m
Length: ~14.0 m Mass: ~6.0–7.5 metric tons |
Formation: Kem Kem Group, Morocco | "The ultimate river monster! With a paddle-like tail, dense bones for ballast, and a gigantic dorsal sail, it traded dry-land speed to become a fully aquatic ambush predator." |
| Suchomimus tenerensis
(Holotype: MNHN GDF 500) |
Early Cretaceous (Aptian–Albian, ~112 Ma) | Height: ~2.5 m
Length: ~10.0–11.0 m Mass: ~3.5–5.2 metric tons |
Formation: Elrhaz Formation, Niger | "The crocodile mimic of the African desert! Its long, slender jaws and powerful forelimbs were expertly engineered to pluck giant prehistoric coelacanths straight out of river channels." |
| Albertosaurus sarcophagus
(Holotype: UAM Z-1) |
Late Cretaceous (Maastrichtian, ~70 Ma) | Height: ~2.4 m
Length: ~8.0–9.0 m Mass: ~1.7–2.0 metric tons |
Formation: Horseshoe Canyon Formation, Canada | "A slender, lightning-fast tyrannosaurid! Bonebed discoveries up in Alberta suggest these sleek hunters may have lived and hunted in coordinated family groups." |
| Alioramus altai
(Holotype: IGM 100/1844) |
Late Cretaceous (Maastrichtian, ~70 Ma) | Height: ~1.2 m
Length: ~5.0–6.0 m Mass: ~350 kg |
Formation: Nemegt Formation, Mongolia | "Look at that low, slender snout covered in distinctive hornlets! It was like a miniature, hyper-agile cousin to Tarbosaurus, dodging the massive apex predators of the Gobi." |
| Daspletosaurus horneri
(Holotype: MOR 590) |
Late Cretaceous (Campanian, ~77–75 Ma) | Height: ~2.5 m
Length: ~9.0 m Mass: ~2.5 metric tons |
Formation: Two Medicine Formation, USA | "Fossil skin impressions show it lacked lips and instead had armored, crocodile-like facial scales filled with sensory nerves. Talk about an intimidating tactical hunter!" |
| Dryptosaurus aquilunguis
(Holotype: ANSP 9995) |
Late Cretaceous (Maastrichtian, ~66 Ma) | Height: ~2.0 m
Length: ~7.5 m Mass: ~1.2 metric tons |
Formation: Marshalltown Formation, USA | "An eastern North American oddity! Long before tyrannosaurs grew to colossal size, Dryptosaurus rocked bizarrely massive, hand-cleaving claws that set it apart from standard tyrannosauroids." |
| Gorgosaurus libratus
(Holotype: NMC 2120) |
Late Cretaceous (Campanian, ~76–75 Ma) | Height: ~2.4 m
Length: ~8.5–9.0 m Mass: ~2.0–2.8 metric tons |
Formation: Dinosaur Park Formation, Canada | "Slightly smaller and sleeker than T. rex, this apex predator shared the bustling Late Cretaceous Canadian floodplains with a staggering diversity of horned dinosaurs." |
| Moros intrepidus
(Holotype: NCSM 33392) |
Late Cretaceous (Cenomanian, ~96 Ma) | Height: ~0.4 m
Length: ~1.2 m Mass: ~11 kg |
Formation: Cedar Mountain Formation, USA | "The tiny harbinger of doom! This delicate, chicken-sized tyrannosauroid shows how small these apex rulers started before global climates shifted and allowed them to take over." |
| Nanotyrannus lethaeus
(Holotype: CMNH 7541) |
Late Cretaceous (Maastrichtian, ~66 Ma) | Height: ~1.5 m
Length: ~5.0–6.5 m Mass: ~350–900 kg |
Formation: Hell Creek Formation, USA | "Whether it's a valid pygmy tyrannosaurid or just an adolescent T. rex, those slender jaws and blade-like teeth are sleek enough to spark endless paleo-debates!" |
| Qianzhousaurus sinensis
(Holotype: GMV V2153) |
Late Cretaceous (Maastrichtian, ~66 Ma) | Height: ~2.0 m
Length: ~6.3 m Mass: ~750 kg |
Formation: Nanxiong Formation, China | "Pinocchio rex! Its extraordinarily long, slender snout proves that tyrannosaurids experimented with different feeding niches, hunting faster, more agile prey in Cretaceous Asia." |
| Tarbosaurus bataar
(Holotype: PIN 551-1) |
Late Cretaceous (Maastrichtian, ~70–66 Ma) | Height: ~3.2 m
Length: ~10.0–12.0 m Mass: ~4.0–5.0 metric tons |
Formation: Nemegt Formation, Mongolia | "The Asiatic king! Its rigid skull structure was custom-evolved to absorb massive impact forces while wrestling giant, neck-stretching sauropods in the Mongolian dust." |
| Tromerosaurus solumons
(Hypothetical / Reference Taxon) |
Late Cretaceous (Maastrichtian, ~66 Ma) | Height: ~2.8 m
Length: ~9.5 m Mass: ~2.5 metric tons |
Formation: Hell Creek Formation, USA | "A fascinating lesser-known entry in the tyrannosauroid record, representing the complex mosaic of mid-to-large theropods occupying the shrinking Cretaceous margins." |
| Tyrannosaurus rex
(Holotype: FMNH PR2081 / Sue) |
Late Cretaceous (Maastrichtian, ~68–66 Ma) | Height: ~3.6–5.0 m
Length: ~12.3–15.0 m Mass: ~8.4–10.5 metric tons |
Formation: Hell Creek Formation, USA / Frenchman Formation, Canada | "The undisputed tyrant lizard king! With a bite force capable of crushing solid bone and binocular vision sharper than a hawk's, it remains the ultimate icon of prehistory." |
Coelurosauria Scientific Catalog
| Taxon & Specimen | Age & Time Period | Dimensions (Hip Height, Length, Mass) | Location Formation | Teodora Villavicencio's Comments (Legend Quest: Master of Myth) (VO: Annemarie Blanco) |
| Coelurus fragilis
(Holotype: YPM 2010) |
Late Jurassic (Kimmeridgian, ~155 Ma) | Height: ~0.6 m
Length: ~2.0 m Mass: ~13–20 kg |
Formation: Morrison Formation, USA | "Such a graceful, slender little hunter! Othniel Charles Marsh named it for its hollow, fragile vertebrae, proving that early coelurosaurs were built like lightning-fast avian athletes." |
| Ornitholestes hermanni
(Holotype: AMNH 619) |
Late Jurassic (Kimmeridgian, ~154 Ma) | Height: ~0.7 m
Length: ~2.0 m Mass: ~12–15 kg |
Formation: Morrison Formation, USA | "That slight bump or possible nasal horn on its snout always sparked debate—was it for display? Either way, this bird-robber was darting through the Morrison ferns with incredible agility." |
| Compsognathus longipes
(Holotype: BSP AS I 563) |
Late Jurassic (Tithonian, ~150 Ma) | Height: ~0.25 m
Length: ~1.0 m Mass: ~0.83–3.5 kg |
Formation: Solnhofen Limestone, Germany | "The classic 'dainty jaw'! Famous for being preserved in fine German limestone with a tiny lizard trapped inside its belly. It shatters the myth that all dinosaurs were house-sized monsters." |
| Sinosauropteryx lingyuanensis
(Holotype: NIGP 127587) |
Early Cretaceous (Barremian, ~125 Ma) | Height: ~0.3 m
Length: ~0.68–1.07 m Mass: ~0.55 kg |
Formation: Yixian Formation, China | "The very first dinosaur found with preserved primitive feather filaments! Melanosome traces even let us know it rocked a reddish-brown coat with a striped tail." |
| Proceratosaurus bradleyi
(Holotype: NHMUK R4860) |
Middle Jurassic (Bathonian, ~167 Ma) | Height: ~0.6 m
Length: ~3.0 m Mass: ~40 kg |
Formation: Great Oolite Group, England | "Long before giant tyrannosaurs ruled, this little English predator was already sporting the early version of a midline nasal crest. A true ancestral pioneer!" |
| Yutyrannus huali
(Holotype: ZCDM V5000) |
Early Cretaceous (Aptian, ~125 Ma) | Height: ~2.5 m
Length: ~9.0 m Mass: ~1.4 metric tons |
Formation: Yixian Formation, China | "Feathered tyrannosauroids the size of a bear! Finding 30-foot apex predators covered in broad, filamentous 'dusted' feathers completely changed how we picture cold-climate hunters." |
| Archaeornithomimus asiaticus
(Holotype: PIN 31-1) |
Late Cretaceous (Campanian, ~75 Ma) | Height: ~1.3 m
Length: ~3.3 m Mass: ~50 kg |
Formation: Iren Dabasu Formation, China | "An ancient ostrich-mimic from the deserts of Inner Mongolia! Built for sheer speed, with long stride lengths that left modern roadrunners in the dust." |
| Deinocheirus mirificus
(Holotype: MPC-D 100/127) |
Late Cretaceous (Maastrichtian, ~70–69 Ma) | Height: ~6.0 m
Length: ~15.0 m Mass: ~6.3–7.0 metric tons |
Formation: Nemegt Formation, Mongolia | "The ultimate paleo-mystery solved! What started as just a pair of enormous 8-foot-long arms turned out to be a humped, duck-billed, mega-sized omnivore. Truly 'horrible hands'!" |
| Dromiceiomimus samueli
(Holotype: UALVP 52631) |
Late Cretaceous (Campanian, ~76 Ma) | Height: ~1.5 m
Length: ~3.5 m Mass: ~100 kg |
Formation: Dinosaur Park Formation, Canada | "Named for its striking resemblance to the modern emu! Its large eyes and sleek, toothless beak indicate it was a keen-sighted forager on the Canadian floodplains." |
| Gallimimus bullatus
(Holotype: GI SPS 100/11) |
Late Cretaceous (Maastrichtian, ~70 Ma) | Height: ~2.0 m
Length: ~6.0 m Mass: ~440 kg |
Formation: Nemegt Formation, Mongolia | "The chicken-mimic that stole the show in Jurassic Park! These massive flocking speedsters could outpace almost any predator in the Nemegt basin." |
| Ornithomimus velox
(Holotype: YPM 542) |
Late Cretaceous (Campanian, ~75 Ma) | Height: ~1.4 m
Length: ~3.5–3.8 m Mass: ~100–150 kg |
Formation: Dinosaur Park Formation, Canada | "One of North America's premier ostrich dinosaurs. Fossil quill knobs on its arms confirm it had a full fan of wing feathers used for display or brooding!" |
| Struthiomimus altus
(Holotype: AMNH 5339) |
Late Cretaceous (Campanian, ~76 Ma) | Height: ~1.4 m
Length: ~4.3 m Mass: ~150 kg |
Formation: Dinosaur Park Formation, Canada | "The ostrich mimic par excellence! With long, slender grasping hands and a specialized keratinous beak, it swept up plants, insects, and small critters with ease." |
| Avimimus nemegtensis
(Holotype: PIN 3907/1) |
Late Cretaceous (Campanian–Maastrichtian, ~70 Ma) | Height: ~0.5 m
Length: ~1.5 m Mass: ~15 kg |
Formation: Nemegt Formation, Mongolia | "Bird mimic supreme! Short-faced, toothless, and sporting a pygostyle tail, it looked remarkably like a ground-dwelling modern bird millions of years before its time." |
| Chirostenotes pergracilis
(Holotype: NMC 8538) |
Late Cretaceous (Campanian, ~75 Ma) | Height: ~0.9 m
Length: ~2.8 m Mass: |
Formation: Dinosaur Park Formation, Canada | "A bizarre caenagnathid oviraptorosaur with a toothless jaw, deep mandible, and weirdly fused claw bones. Every new bone we find adds to its puzzle!" |
| Conchoraptor gracilis
(Holotype: GI SPS 100/20) |
Late Cretaceous (Campanian, ~70 Ma) | Height: ~0.4 m
Length: ~1.0–1.4 m Mass: ~20 kg |
Formation: Djadokhta Formation, Mongolia | "Named after conch shells because scientists originally wondered if it crushed mollusks with its deep beak. Its light, pneumatic skull is a marvel of evolutionary engineering." |
| Elmisaurus rarus
(Holotype: ZPAL MgD-I/17) |
Late Cretaceous (Maastrichtian, ~70 Ma) | Height: ~0.8 m
Length: ~2.0 m Mass: ~30 kg |
Formation: Nemegt Formation, Mongolia | "Known famously from slender hand and foot bones, this rare oviraptorosaurian cousin glided silently through the ancient Asian forests." |
| Oviraptor philoceratops
(Holotype: AMNH 6517) |
Late Cretaceous (Campanian, ~75 Ma) | Height: ~0.5 m
Length: ~1.6 m Mass: ~33–40 kg |
Formation: Djadokhta Formation, Mongolia | "Framed unfairly as an 'egg thief' because its fossils were found near nests—which we later discovered were actually its own nests! A dedicated, brooding parent of the Gobi." |
| Protarchaeopteryx robusta
(Holotype: IVPP V9653) |
Early Cretaceous (Barremian, ~125 Ma) | Height: ~0.3 m
Length: ~1.0 m Mass: ~1.5–2.0 kg |
Formation: Yixian Formation, China | "Symmetrical pennaceous feathers on its tail and arms! It couldn't truly fly, but its display plumage was a dazzling preview of the avian revolution." |
Advanced Theropods & Avialae Scientific Catalog
| Taxon & Specimen | Age & Time Period | Dimensions (Hip Height, Length, Mass) | Location Formation | Teodora Villavicencio's Comments (Legend Quest: Master of Myth) (VO: Annemarie Blanco) |
| Erlikosaurus andrewsi
(Holotype: GI SPS 100/111) |
Late Cretaceous (Cenomanian–Turonian, ~90 Ma) | Height: ~2.0 m
Length: ~4.5–6.0 m Mass: ~500 kg |
Formation: Bayan Shireh Formation, Mongolia | "Look at those leaf-shaped teeth and tiny beak! This herbivorous therizinosaur used its pot-belly to ferment plants, completely defying what a meat-eater's family tree looks like." |
| Segnosaurus galbinensis
(Holotype: GI SPS 100/82) |
Late Cretaceous (Cenomanian–Turonian, ~93–89 Ma) | Height: ~2.5 m
Length: ~6.0–7.0 m Mass: ~1.3 metric tons |
Formation: Bayan Shireh Formation, Mongolia | "When scientists first found its weird pelvic bones and turtle-like lower jaws, they had no idea what it was. A bizarre, slow-moving browser of Cretaceous river basins!" |
| Therizinosaurus cheloniformis
(Holotype: PIN 551-483) |
Late Cretaceous (Maastrichtian, ~70 Ma) | Height: ~4.5–5.0 m
Length: ~10.0 m Mass: ~5.0 metric tons |
Formation: Nemegt Formation, Mongolia | "Those three-foot-long scythe claws look like a horror movie prop, but they were actually used to pull down high branches and foliage. The ultimate gentle giant of the Asian forests!" |
| Saurornithoides mongoliensis
(Holotype: AMNH 6516) |
Late Cretaceous (Campanian, ~75 Ma) | Height: ~0.6 m
Length: ~2.0–3.0 m Mass: ~20–30 kg |
Formation: Djadokhta Formation, Mongolia | "Lizard-bird of the Gobi! With an enlarged braincase and binocular vision, its hunting intelligence was leagues ahead of standard primitive predators." |
| Stenonychosaurus inequalis
(Holotype: UCMZ 12) |
Late Cretaceous (Campanian, ~76 Ma) | Height: ~0.9 m
Length: ~2.4 m Mass: ~35–50 kg |
Formation: Dinosaur Park Formation, Canada | "North America's stealthy nocturnal hunter! Those massive, pivoting eyes meant it could track down small mammals under the dim canopy of the Late Cretaceous." |
| Troodon formosus
(Holotype: YPM 1903) |
Late Cretaceous (Campanian, ~77–74 Ma) | Height: ~0.9 m
Length: ~2.4 m Mass: ~45–50 kg |
Formation: Judith River Group, USA | "Starting out life known from just a single, strangely serrated tooth, this iconic troodontid sparked decades of debate about dinosaur intelligence and sensory prowess." |
| Bambiraptor feinbergi
(Holotype: AMNH FR 30556) |
Late Cretaceous (Campanian, ~72 Ma) | Height: ~0.3 m
Length: ~0.7–1.0 m Mass: ~2–3 kg |
Formation: Two Medicine Formation, Canada / USA | "Named after the famous deer! This juvenile dromaeosaurid specimen gave us an incredible look at bird-like brain expansions and agile forest leaping." |
| Dakotaraptor steini
(Holotype: PBMNH P.10.113.T) |
Late Cretaceous (Maastrichtian, ~66 Ma) | Height: ~1.8 m
Length: ~5.5 m Mass: ~250–350 kg |
Formation: Hell Creek Formation, USA | "A giant, heavyweight raptor sharing the very same turf as T. rex! Those 9.5-inch quill knobs on its forearms prove it rocked full, majestic wings." |
| Deinonychus antirrhopus
(Holotype: YPM 5205) |
Early Cretaceous (Aptian, ~115–108 Ma) | Height: ~1.0 m
Length: ~3.4 m Mass: ~73–100 kg |
Formation: Cloverly Formation, USA | "The dinosaur that sparked the 'Renaissance'! Its lethal sickle claw and active posture completely revolutionized how the world viewed warm-blooded, dynamic dinosaurs." |
| Dromaeosaurus albertensis
(Holotype: NMC 5711) |
Late Cretaceous (Campanian, ~76 Ma) | Height: ~0.7 m
Length: ~2.0 m Mass: ~15–20 kg |
Formation: Dinosaur Park Formation, Canada | "The robust trailblazer of the Canadian badlands! Shorter-snouted and built with a heavier bite force than its sleeker raptor cousins." |
| Saurornitholestes sullivani
(Holotype: SMP VP-1270) |
Late Cretaceous (Campanian, ~75 Ma) | Height: ~0.5 m
Length: ~1.8 m Mass: ~10 kg |
Formation: Kirtland Formation, USA | "An agile, cat-sized hunter dashing through southwestern floodplains. Its exceptionally sharp senses made it a master of catching elusive prey." |
| Velociraptor osmolskae
(Holotype: MPC-D 100/985) |
Late Cretaceous (Campanian, ~75–71 Ma) | Height: ~0.5 m
Length: ~2.0 m Mass: ~15 kg |
Formation: Bayan Mandahu Formation, China | "The Asian counterpart to V. mongoliensis! Proof that these lightning-fast pack hunters ruled the dunes across multiple regions of the Gobi desert." |
| Microraptor gui
(Holotype: IVPP V13352) |
Early Cretaceous (Aptian, ~120 Ma) | Height: ~0.2 m
Length: ~0.77–0.8 m Mass: ~1 kg |
Formation: Jiufotang Formation, China | "The four-winged glider! With long, asymmetrical feathers on both its arms and its hind legs, it drifted gracefully from tree to tree in prehistoric Liaoning." |
| Archaeopteryx albersdoerferi
(Holotype / Specimen: Bürgermeister-Müller Museum) |
Late Jurassic (Tithonian, ~150 Ma) | Height: ~0.3 m
Length: ~0.5 m Mass: ~0.8–1.0 kg |
Formation: Solnhofen Limestone, Germany | "The ultimate transitional icon! Featuring teeth, a long bony tail, and full flight feathers, it bridges the gap between terrifying theropod dinosaurs and modern birds with absolute grace." |
Sauropodomorpha (Prosauropoda) Scientific Catalog
| Taxon & Specimen | Age & Time Period | Dimensions (Hip Height, Length, Mass) | Location Formation | Teodora Villavicencio's Comments (Legend Quest: Master of Myth) (VO: Annemarie Blanco) |
| Anchisaurus polyzelus
(Holotype: YPM 1883) |
Early Jurassic (Hettangian–Sinemurian, ~200–188 Ma) | Height: ~0.7 m
Length: ~2.0–2.5 m Mass: ~27–50 kg |
Formation: Portland Formation, USA | "One of the earliest dinosaur fossils ever found in North America! It could walk on two legs or four, showing the evolutionary transition toward true browsing giants." |
| Efraasia minor
(Holotype: SMNS 12667) |
Late Triassic (Norian, ~210 Ma) | Height: ~0.8 m
Length: ~4.0–6.5 m Mass: ~100–130 kg |
Formation: Löwenstein Formation, Germany | "A slender German prosauropod with long, grasping hands! Perfect for stripping down early Triassic vegetation before the super-sauropods took over." |
| Eoraptor lunensis
(Holotype: PVSJ 512) |
Late Triassic (Carnian, ~231 Ma) | Height: ~0.4 m
Length: ~1.0–1.7 m Mass: ~10–17 kg |
Formation: Ischigualasto Formation, Argentina | "The dawn plunderer! Sitting right at the root of the dinosaur family tree, showing us how small and nimble the common ancestor of both theropods and sauropods really was." |
| Massospondylus kaalae
(Holotype: BP/1/4779) |
Early Jurassic (Sinemurian, ~200–183 Ma) | Height: ~1.0 m
Length: ~4.0–5.0 m Mass: ~150–300 kg |
Formation: Elliot Formation, South Africa | "A classic South African long-neck! Its thumb claws were built like curved daggers, likely used for defense or gathering food down in ancient river valleys." |
| Melanorosaurus readi
(Holotype: SAM-PK-3449) |
Late Triassic to Early Jurassic (Norian–Sinemurian, ~216–200 Ma) | Height: ~2.5 m
Length: ~8.0–12.0 m Mass: ~1.0–3.3 metric tons |
Formation: Lower Elliot Formation, South Africa | "Look at that heavy, pillar-like limb structure! It represents the exact moment prosauropods started bulking up into true, quadrupedal sauropod titans." |
| Mussaurus patagonicus
(Holotype: PVL 4097) |
Late Triassic (Norian, ~215 Ma) | Height: ~0.3 m (Adults: ~1.5 m)
Length: ~1.5 m (Adults: ~6.0 m) Mass: ~1.0 kg (Adults: ~1.0 metric ton) |
Formation: El Tranquil Formation, Argentina | "The 'mouse lizard'! Famous for finding exquisite fossilized hatchlings nested together in Argentina, showing how these giants started life tiny." |
| Plateosaurus gracilis
(Holotype: SMNS 13200) |
Late Triassic (Norian, ~214–204 Ma) | Height: ~2.0 m
Length: ~5.0–8.0 m Mass: ~600–700 kg |
Formation: Trossingen Formation, Germany | "The great German swamp-dweller! Bonebeds packed with dozens of individuals prove they roamed in large herds across central Europe long before the Jurassic." |
| Riojasaurus incertus
(Holotype: PVL 3808) |
Late Triassic (Norian, ~227–213 Ma) | Height: ~2.5 m
Length: ~6.6–10.0 m Mass: ~800–3,000 kg |
Formation: Los Colorados Formation, Argentina | "A heavy, rigid-backed quadruped from Argentina! Its chunky legs and solid bones show it stayed firmly on all fours while browsing high foliage." |
| Thecodontosaurus antiquus
(Holotype: BRSUG 26120) |
Late Triassic (Rhaetian, ~205 Ma) | Height: ~0.6 m
Length: ~2.0–2.5 m Mass: ~30–40 kg |
Formation: Magnesian Conglomerate, England | "Bristol's very own ancient lizard! One of the first dinosaurs ever named in British paleontology, browsing through island-like archipelago rocks." |
| Yunnanosaurus youngi
(Holotype: IVPP V20) |
Early Jurassic (Sinemurian–Pliensbachian, ~200–190 Ma) | Height: ~2.0 m
Length: ~6.0–7.0 m Mass: ~400–600 kg |
Formation: Lufeng Formation, China | "Its spoon-shaped teeth were uniquely specialized for snipping and grinding plant matter, making it one of the most successful herbivores of early Jurassic China." |
| Smurfette smurfensis
(Fictional Specimen: Village Mushroom Archive) |
Holocene to Prehistoric Crossover Era | Height: ~0.05 m
Length: ~0.05 m Mass: ~0.02 kg |
Formation: Smurf Village Botanical Layer, Belzat Forest | "Well, now I've seen everything! A three-apple-tall blue wanderer exploring the sauropod tracks. Let's just hope Gargamel's pet cat Azrael doesn't try to hunt this little mythologist!" |
Sauropoda Scientific Catalog
| Taxon & Specimen | Age & Time Period | Dimensions (Hip Height, Length, Mass) | Location Formation | Teodora Villavicencio's Comments (Legend Quest: Master of Myth) (VO: Annemarie Blanco) |
| Alamosaurus sanjuanensis
(Holotype: USNM 15560) |
Late Cretaceous (Maastrichtian, ~69–66 Ma) | Height: ~12.0 m
Length: ~26.0–30.0 m Mass: ~30–73 metric tons |
Formation: Ojo Alamo Formation / Naashoibito Member, USA | "North America's last great sauropod! These colossal survivors walked right up to the end of the Cretaceous, dodging T. rex on the very edge of extinction." |
| Amargasaurus cazaui
(Holotype: MACN-RN 1001) |
Early Cretaceous (Barremian, ~129–122 Ma) | Height: ~2.5 m
Length: ~9.0–10.0 m Mass: ~2.6 metric tons |
Formation: La Amarga Formation, Argentina | "Look at those paired, needle-like neural spines streaming off its neck! They may have supported a double keratinous sail for visual display or defense." |
| Apatosaurus ajax
(Holotype: YPM 1980) |
Late Jurassic (Kimmeridgian–Tithonian, ~152 Ma) | Height: ~6.5 m
Length: ~21.0–27.0 m Mass: ~16–22 metric tons |
Formation: Morrison Formation, USA | "The classic whip-tailed gentle giant! Its tail could literally crack like a supersonic bullwhip to deter hungry allosaurids." |
| Barapasaurus tagorei
(Holotype: GSI IMC K27/694) |
Early Jurassic (Sinemurian–Pliensbachian, ~190–183 Ma) | Height: ~3.5 m
Length: ~14.0 m Mass: ~10–14 metric tons |
Formation: Kota Formation, India | "One of the earliest true sauropods! Named in honor of Rabindranath Tagore, this Indian pioneer shows how fast early long-necks scaled up in mass." |
| Brachiosaurus altithorax
(Holotype: FMNH P 25107) |
Late Jurassic (Kimmeridgian–Tithonian, ~154–153 Ma) | Height: ~9.0–14.0 m
Length: ~20.0–26.0 m Mass: ~28–56 metric tons |
Formation: Morrison Formation, USA / Kota Formation, India | "Built like a living giraffe-tower! With longer front legs than back legs, it browsed the highest conifer treetops that other herbivores couldn't even reach." |
| Camarasaurus supremus
(Holotype: AMNH 5761) |
Late Jurassic (Kimmeridgian–Tithonian, ~155–145 Ma) | Height: ~4.5 m
Length: ~15.0–18.0 m Mass: ~15–23 metric tons |
Formation: Morrison Formation, USA | "The most common sauropod in the Morrison quarry! Its blunt, box-like snout and spoon teeth were expert tools for chomping coarser Jurassic vegetation." |
| Cetiosaurus oxoniensis
(Lectotype: OUMNH J.13605) |
Middle Jurassic (Bathonian–Callovian, ~168–164 Ma) | Height: ~4.0 m
Length: ~15.0–16.0 m Mass: ~15–25 metric tons |
Formation: Chipping Norton Limestone / Rutland Formation, England | "The 'whale lizard'! One of the first dinosaurs ever scientifically described, giving 19th-century paleontologists their very first peek into England's prehistoric deep past." |
| Dicraeosaurus sattleri
(Holotype: MB.R.MB.R.4332) |
Late Jurassic (Kimmeridgian, ~150 Ma) | Height: ~3.0 m
Length: ~12.0–14.0 m Mass: ~4.0–5.0 metric tons |
Formation: Tendaguru Formation, Tanzania | "A short-necked, fork-spined African marvel! It traded extra neck length for a lightweight, highly maneuverable frame in the lush Tendaguru floodplains." |
| Diplodocus hallorum
(Holotype: WDC-DHS-1 / formerly Seismosaurus) |
Late Jurassic (Kimmeridgian–Tithonian, ~154–152 Ma) | Height: ~5.0 m
Length: ~32.0–35.0 m Mass: ~12–15 metric tons |
Formation: Morrison Formation, USA | "An astonishingly long creature! More than half its total length was just a slender, whip-like tail designed to keep Morrison predators at a very safe distance." |
| Dreadnoughtus schrani
(Holotype: MPM-PV 1156) |
Late Cretaceous (Campanian, ~77 Ma) | Height: ~16.0 m
Length: ~26.0 m Mass: ~22–59 metric tons |
Formation: Cerro Barcino Formation, Argentina | "Named after battleships because it 'fearing nothing'! With massive muscle scars etched into its bones, this titan was an absolute fortress on four legs." |
| Euhelopus zdanskyi
(Holotype: PM U 236) |
Early Cretaceous (Aptian–Albian, ~118–113 Ma) | Height: ~4.0 m
Length: ~15.0 m Mass: ~15–20 metric tons |
Formation: Mengyin Formation, China | "One of China's classic Cretaceous sauropods! Its elevated shoulders and uniquely curved skull made it a striking fixture of East Asian flood basins." |
| Mamenchisaurus sinocanadorum
(Holotype: IVPP V.9404) |
Late Jurassic (Oxfordian–Kimmeridgian, ~162–155 Ma) | Height: ~17.0 m
Length: ~26.0–35.0 m Mass: ~12–25 metric tons |
Formation: Shaximiao Formation, China | "Half its body length was pure neck! Holding the record for one of the longest necks in the animal kingdom, supported by an incredible web of pneumatic ribs." |
| Omeisaurus fuxiensis
(Holotype: IVPP V.4401) |
Middle to Late Jurassic (Bathonian–Oxfordian, ~165–155 Ma) | Height: ~4.5 m
Length: ~20.0 m Mass: ~9–15 metric tons |
Formation: Shaximiao Formation, China | "Named after Mount Omei, this magnificent Asian sauropod sported a long, whip-like tail and a robust ribcage designed for high-capacity plant digestion." |
| Opisthocoelicaudia skarzynskii
(Holotype: ZPAL MgD-I/48) |
Late Cretaceous (Maastrichtian, ~70 Ma) | Height: ~3.0 m
Length: ~11.4–12.0 m Mass: ~8.4–10 metric tons |
Formation: Nemegt Formation, Mongolia | "A heavy, tank-like titanosaur from the Nemegt basin that famously lacked a preserved skull. Its ball-and-socket tail vertebrae gave it incredible spinal flexibility!" |
| Patagotitan mayorum
(Holotype: MPEF-PV 3400) |
Late Cretaceous (Cenomanian, ~101 Ma) | Height: ~17.0 m
Length: ~37.0 m Mass: ~57–70 metric tons |
Formation: Cerro Barcino Formation, Argentina | "Titan of titans! Discovered in Argentine Patagonia, this colossus pushes the physical boundaries of how heavy a land animal could possibly grow." |
| Saltasaurus loricatus
(Holotype: PVL 4017-91) |
Late Cretaceous (Campanian–Maastrichtian, ~70–66 Ma) | Height: ~2.0 m
Length: ~12.0–12.8 m Mass: ~7.0 metric tons |
Formation: Lecho Formation, Argentina | "The armored sauropod! Who says giant long-necks couldn't defend themselves? It carried bony osteoderms embedded in its skin like a prehistoric tank." |
| Sauroposeidon proteles
(Holotype: OMNH 53062) |
Early Cretaceous (Aptian, ~110 Ma) | Height: ~18.0 m
Length: ~27.0–34.0 m Mass: ~40–60 metric tons |
Formation: Antlers Formation, USA | "The earthquake god lizard! Standing tall enough to look into a modern six-story building window, it was the absolute height of Early Cretaceous sauropod evolution." |
| Supersaurus vivianae
(Holotype: WDC DMNH 25992) |
Late Jurassic (Kimmeridgian–Tithonian, ~153 Ma) | Height: ~21.5 m
Length: ~33.0–45.0 m Mass: ~31–50 metric tons |
Formation: Morrison Formation, USA | "Super by name, super by nature! One of the longest dinosaurs ever recovered from the Morrison, stretching across landscapes with breathtaking scale." |
Ornithischia (Cerapoda & Ornithopoda) Scientific Catalog
| Taxon & Specimen | Age & Time Period | Dimensions (Hip Height, Length, Mass) | Location Formation | Teodora Villavicencio's Comments (Legend Quest: Master of Myth) (VO: Annemarie Blanco) |
| Abrictosaurus consors
(Holotype: UCL BIV 50) |
Early Jurassic (Hettangian–Sinemurian, ~200–190 Ma) | Height: ~0.3 m
Length: ~1.2 m Mass: ~3 kg |
Formation: Upper Elliot Formation, Lesotho | "Look at those prominent canine-like tusks! Even though they were plant-eaters, these heterodontosaurids weren't afraid to flash some dental bling when defending themselves." |
| Echinodon becklesii
(Holotype: BMNH 48209) |
Early Cretaceous (Berriasian, ~145 Ma) | Height: ~0.2 m
Length: ~0.6 m Mass: ~1 kg |
Formation: Purbeck Group, England | "The 'spiny tooth'! A tiny, pocket-sized ornithischian from England with unique self-sharpening teeth that let it clip stubborn prehistoric plants with surgical precision." |
| Fabrosaurus australis
(Holotype: MNHN LES 1) |
Early Jurassic (Hettangian–Sinemurian, ~200 Ma) | Height: ~0.3 m
Length: ~1.0 m Mass: ~5 kg |
Formation: Upper Elliot Formation, Lesotho | "A foundational name in early ornithischian history! Though fragmentary, its leaf-shaped cheek teeth proved that nimble little browsers were already diversifying rapidly." |
| Geranosaurus atavus
(Holotype: SAM-PK-1871) |
Early Jurassic (Hettangian–Sinemurian, ~200 Ma) | Height: ~0.4 m
Length: ~1.2 m Mass: ~6 kg |
Formation: Upper Elliot Formation, South Africa | "The 'crane lizard'! Named for its slender, bird-like lower jaw structure, showing how early South African herbivores adapted for selective feeding." |
| Heterodontosaurus tucki
(Holotype: SAM-PK-3372) |
Early Jurassic (Hettangian–Sinemurian, ~200–190 Ma) | Height: ~0.5 m
Length: ~1.2 m Mass: ~2.5–5 kg |
Formation: Upper Elliot Formation, South Africa | "The weird-toothed wonder! Complete with chisel-like front teeth, chewing cheek teeth, and sharp canine tusks. It's like a prehistoric rodent crossed with a sabertooth!" |
| Lesothosaurus diagnosticus
(Holotype: BMNH R11956) |
Early Jurassic (Hettangian–Sinemurian, ~200–196 Ma) | Height: ~0.4 m
Length: ~1.0 m Mass: ~4–7 kg |
Formation: Upper Elliot Formation, Lesotho / South Africa | "Lightning-fast and blindingly agile! This basal ornithischian zipped across southern Africa's arid plains on long, slender hind legs." |
| Pisanosaurus mertii
(Holotype: PVL 2577) |
Late Triassic (Carnian–Norian, ~228–216 Ma) | Height: ~0.3 m
Length: ~1.0 m Mass: ~2.5 kg |
Formation: Ischigualasto Formation, Argentina | "One of the oldest known ornithischians of all! Marking the very dawn of the bird-hipped lineage in the sun-baked floodplains of Argentina." |
| Callovosaurus leedsi
(Holotype: BMNH R3165) |
Middle Jurassic (Callovian, ~165 Ma) | Height: ~0.8 m
Length: ~2.5 m Mass: ~50 kg |
Formation: Oxford Clay Formation, England | "An elusive Middle Jurassic iguanodontian! Known from fragmentary fossils tucked away in English marine clays, giving us a rare glimpse into pre-Morrison herbivores." |
| Camptosaurus dispar
(Holotype: YPM 1877) |
Late Jurassic (Kimmeridgian–Tithonian, ~156–145 Ma) | Height: ~1.0 m
Length: ~6.0–7.0 m Mass: ~780–800 kg |
Formation: Morrison Formation, USA | "The sturdy, flexible runner of the Morrison! It could graze comfortably on all fours or stand tall on its hind legs to reach mid-level canopy shrubs." |
| Dryosaurus elderae
(Holotype: YPM 1876) |
Late Jurassic (Kimmeridgian–Tithonian, ~155–145 Ma) | Height: ~1.2 m
Length: ~2.4–4.0 m Mass: ~70–100 kg |
Formation: Morrison Formation, USA | "Built like a gazelle! With huge eyes and an aerodynamic snout, it relied entirely on blistering speed to outrun allosaurs and ceratosaurs." |
| Fulgurotherium australe
(Holotype: BMNH R3717) |
Early Cretaceous (Aptian–Albian, ~112–100 Ma) | Height: ~0.5 m
Length: ~1.5 m Mass: ~15 kg |
Formation: Griman Creek Formation, Australia | "The 'lightning beast' from down under! A small, swift hypsilophodontid darting through the ancient polar forests of southeastern Australia." |
| Hippodraco scutodens
(Holotype: UMNH VP 20208) |
Early Cretaceous (Valanginian, ~132 Ma) | Height: ~1.2 m
Length: ~4.5 m Mass: ~300 kg |
Formation: Cedar Mountain Formation, USA | "The horse-dragon! Named for its elongated horse-like facial profile, representing a fascinating early basal iguanodontian stepping stone in North America." |
| Hypsilophodon foxii
(Holotype: BMNH R196) |
Early Cretaceous (Barremian, ~130–125 Ma) | Height: ~0.5 m
Length: ~1.5–2.0 m Mass: ~20 kg |
Formation: Wessex Formation, England | "The classic nimble biped! For a long time, scientists thought it climbed trees, but its specialized beak and rigid tail prove it was an absolute ground-sprinter." |
| Iguanodon bernissartensis
(Holotype: IRSNB 1536) |
Early Cretaceous (Barremian–Aptian, ~126–122 Ma) | Height: ~4.5 m
Length: ~9.0–11.2 m Mass: ~3.0–4.8 metric tons |
Formation: Bernissart Clay / Wealden Group, Belgium | "The famous spiked thumb! Discovered packed by the dozens in a Belgian coal mine. That conical thumb spike was a lethal close-quarters weapon against predators." |
| Loncosaurus argentinus
(Holotype: MACN A-52) |
Late Cretaceous (Coniacian–Campanian, ~85 Ma) | Height: ~0.7 m
Length: ~2.0 m Mass: ~30 kg |
Formation: Bajo Barreal Formation, Argentina | "A mysterious Patagonian ornithopod! Known from sparse skeletal fragments, showing just how widespread these small-to-mid-sized herbivores were in South America." |
| Muttaburrasaurus langdoni
(Holotype: QMF 61) |
Early Cretaceous (Albian, ~105–100 Ma) | Height: ~2.0 m
Length: ~7.0–8.0 m Mass: ~2.8 metric tons |
Formation: Allaru Mudstone / Mackunda Formation, Australia | "Look at that hollow, swollen nasal arch on its snout! It likely acted as a resonating chamber to broadcast deep, booming calls across the Australian river plains." |
| Nanosaurus agilis
(Holotype: YPM 1913) |
Late Jurassic (Kimmeridgian–Tithonian, ~155 Ma) | Height: ~0.3 m
Length: ~2.0 m Mass: ~10 kg |
Formation: Morrison Formation, USA | "The dainty lizard! Othniel Charles Marsh's tiny basal ornithischian that scurried around the feet of towering Morrison sauropods." |
| Ouranosaurus nigeriensis
(Holotype: MNHN GDF 300) |
Early Cretaceous (Aptian–Albian, ~125–112 Ma) | Height: ~2.7 m
Length: ~7.0–8.3 m Mass: ~2.2–4.0 metric tons |
Formation: Elrhaz Formation, Niger | "A majestic sail-backed iguanodontian from the Sahara! Unlike Spinosaurus, its neural spines formed a broad, muscular hump or display sail across its back." |
| Parksosaurus warreni
(Holotype: ROM 804) |
Late Cretaceous (Maastrichtian, ~70–66 Ma) | Height: ~0.6 m
Length: ~2.5 m Mass: ~45 kg |
Formation: Horseshoe Canyon Formation, Canada | "Named after pioneering Canadian paleontologist William Parks! A sleek, big-eyed hypsilophodontid ducking through the closing chapters of the Cretaceous." |
| Probactrosaurus gobiensis
(Holotype: PIN 2232-1) |
Early Cretaceous (Albian–Cenomanian, ~105–95 Ma) | Height: ~1.8 m
Length: ~6.0 m Mass: ~1.0 metric ton |
Formation: Dzunbayan / Khukhtek Formation, Mongolia / China | "The evolutionary bridge to the giant duck-bills! Its advanced dental batteries and snout structure previewed the massive hadrosaur take-over." |
| Tenontosaurus dossi
(Holotype: SMU 68462) |
Early Cretaceous (Aptian–Albian, ~115–105 Ma) | Height: ~1.5 m
Length: ~6.0–7.0 m Mass: ~1.0 metric ton |
Formation: Antlers / Twin Mountains Formation, USA | "The ultimate prey package! Famous for fossil sites where multiple Deinonychus skeletons surround a single Tenontosaurus, showing complex predator-prey dynamics." |
| Thescelosaurus garbanii
(Holotype: LACM 23845) |
Late Cretaceous (Maastrichtian, ~66 Ma) | Height: ~1.0 m
Length: ~3.5–4.0 m Mass: ~200–300 kg |
Formation: Hell Creek Formation, USA | "The wonderful pebble-toothed herbivore! Some specimens even preserve fossilized skin and internal body armor rings, making it one of the best-understood last-minute survivors." |
| Valdosaurus canaliculatus
(Holotype: BMNH R187) |
Early Cretaceous (Valanginian–Barremian, ~140–125 Ma) | Height: ~0.6 m
Length: ~2.0 m Mass: ~30 kg |
Formation: Wessex Formation / Wealden Group, England | "Named after the Isle of Wight's ancient Valdean rocks! A fast-moving, slender dryosaurid skipping through European swamp forests." |
| Zephyrosaurus schaffi
(Holotype: MCZ 4392) |
Early Cretaceous (Aptian–Albian, ~115–110 Ma) | Height: ~0.5 m
Length: ~1.8 m Mass: ~20 kg |
Formation: Cloverly Formation, USA | "The western wind lizard! Sporting a remarkably rugged skull with distinct muscle bumps, suggesting it engaged in head-butting or species display rituals." |
Hadrosauridae Scientific Catalog
| Taxon & Specimen | Age & Time Period | Dimensions (Hip Height, Length, Mass) | Location Formation | Teodora Villavicencio's Comments (Legend Quest: Master of Myth) (VO: Annemarie Blanco) |
| Brachylophosaurus canadensis
(Holotype: ROM 867) |
Late Cretaceous (Campanian, ~76.5 Ma) | Height: ~2.5 m
Length: ~7.0–9.0 m Mass: ~3.0–4.0 metric tons |
Formation: Oldman / Judith River Formation, Canada / USA | "Look at that flat, bony paddle on top of its skull! It looks almost like a medieval helmet. Nicknamed 'Leonardo' because of incredible mummified fossil preservation with skin intact!" |
| Corythosaurus casuarius
(Holotype: AMNH 5240) |
Late Cretaceous (Campanian, ~77–75 Ma) | Height: ~2.8 m
Length: ~9.0 m Mass: ~3.0–4.0 metric tons |
Formation: Dinosaur Park Formation, Canada / Lance Formation, USA | "The helmet lizard! That hollow, semi-circular crest housed looping nasal passages that could trumpet haunting, resonant honks across the Cretaceous river valleys." |
| Edmontosaurus regalis
(Holotype: NMC 2288) |
Late Cretaceous (Maastrichtian, ~73–66 Ma) | Height: ~3.0 m
Length: ~12.0–13.0 m Mass: ~4.0–9.0 metric tons |
Formation: Horseshoe Canyon Formation, Canada / Lance Formation, USA | "One of the ultimate mega-herbivores of the late Cretaceous! Some mummified 'dinosaur mummy' specimens even preserve soft tissue duck-bills and fleshy head combs." |
| Hypacrosaurus stebingeri
(Holotype: MOR 549) |
Late Cretaceous (Campanian–Maastrichtian, ~75–67 Ma) | Height: ~3.0 m
Length: ~9.1–10.7 m Mass: ~4.0 metric tons |
Formation: Two Medicine Formation, USA / Dinosaur Park Formation, Canada | "The 'highest near lizard'! Fossil nesting grounds with eggs and tiny embryos show these massive social mothers lovingly cared for their hatchlings in sprawling colonies." |
| Kritosaurus navajovius
(Holotype: AMNH 5799) |
Late Cretaceous (Campanian, ~73 Ma) | Height: ~2.5 m
Length: ~8.0–9.0 m Mass: ~3.0 metric tons |
Formation: Kirtland Formation, USA | "The classic 'chosen lizard' of the American Southwest! Featuring a distinctive, slightly arched nasal hump that gave it a uniquely proud facial profile." |
| Lambeosaurus magnicristatus
(Holotype: NMC 8705) |
Late Cretaceous (Campanian, ~75 Ma) | Height: ~3.0 m
Length: ~9.0–15.0 m Mass: ~3.5–5.8 metric tons |
Formation: Dinosaur Park Formation, Canada | "That magnificent, axe-like hollow crest towering over its head is an engineering marvel! A true acoustic masterpiece of the Canadian badlands." |
| Maiasaura peeblesorum
(Holotype: PU 22405) |
Late Cretaceous (Campanian, ~76.7 Ma) | Height: ~2.5 m
Length: ~7.0–9.0 m Mass: ~2.0–3.0 metric tons |
Formation: Two Medicine Formation, USA | "The 'good mother lizard'! Discovering 'Egg Mountain' revolutionized paleontology by proving dinosaurs fed and raised their babies in communal nesting grounds like modern birds." |
| Olorotitan arharensis
(Holotype: AEHM 2/845) |
Late Cretaceous (Maastrichtian, ~72–66 Ma) | Height: ~3.1 m
Length: ~8.0–12.0 m Mass: ~3.5–4.5 metric tons |
Formation: Yuliangze Formation, Russia / China | "The giant swan of Asia! Its hollow crest was shaped like a broad, sweeping axe or fan, making it one of the most elegant and distinct lambeosaurines ever found." |
| Parasaurolophus walkeri
(Holotype: ROM 768) |
Late Cretaceous (Campanian, ~76–73 Ma) | Height: ~2.5 m
Length: ~9.5–10.0 m Mass: ~2.5–3.5 metric tons |
Formation: Dinosaur Park Formation, Canada | "The trombone of the Cretaceous! That iconic six-foot-long back-swept tube allowed it to broadcast low-frequency foghorn calls across dense swamps." |
| Saurolophus osborni
(Holotype: AMNH 5220) |
Late Cretaceous (Maastrichtian, ~70–66 Ma) | Height: ~3.0 m
Length: ~9.0–12.0 m Mass: ~3.0–4.2 metric tons |
Formation: Edmonton Group / Nemegt Formation, Canada / Mongolia | "Spiked lizard! Sporting a solid, backward-pointing bony spike on its head rather than a hollow tube. A trans-continental survivor bridging North America and Asia!" |
| Shantungosaurus giganteus
(Holotype: GMV H V1853) |
Late Cretaceous (Campanian–Maastrichtian, ~73–66 Ma) | Height: ~5.0–6.0 m
Length: ~14.7–16.6 m Mass: ~13.0–16.0 metric tons |
Formation: Wangshi Group, China | "The absolute heavyweight champion of the duck-bills! Growing as large as a small sauropod, proving that non-sauropod herbivores could reach colossal proportions." |
| Tsintaosaurus spinorhinus
(Holotype: IVPP V725) |
Late Cretaceous (Campanian–Maastrichtian, ~72–66 Ma) | Height: ~2.5 m
Length: ~8.0–10.0 m Mass: ~2.5–3.0 metric tons |
Formation: Wangshi Group, China | "The famous 'unicorn' duck-bill! Though early reconstructions mistakenly stuck a single vertical tube right on its nose like a unicorn horn, its crest is actually a forward-projecting ridge." |
Pachycephalosauria Scientific Catalog
| Taxon & Specimen | Age & Time Period | Dimensions (Hip Height, Length, Mass) | Location Formation | Teodora Villavicencio's Comments (Legend Quest: Master of Myth) (VO: Annemarie Blanco) |
| Dracorex hogwartsia
(Holotype: TCM 2004.1.1) |
Late Cretaceous (Maastrichtian, ~66 Ma) | Height: ~1.2 m
Length: ~2.4–3.0 m Mass: ~50–75 kg |
Formation: Hell Creek Formation, USA | "Named after Hogwarts because its flat, spiked skull looks straight out of Harry Potter! Though some paleontologists think it's just a juvenile Pachycephalosaurus, those dragon horns are pure fantasy come to life." |
| Goyocephale lattimorei
(Holotype: GI SPS 100/1501) |
Late Cretaceous (Campanian, ~75 Ma) | Height: ~0.6 m
Length: ~1.8 m Mass: ~40 kg |
Formation: Barun Goyot Formation, Mongolia | "A sleek Mongolian dome-head with a flat, wedge-shaped skull roof and fenestrae! It shows how early pachycephalosaurs experimented with skull ornamentation." |
| Homalocephale calathocercos
(Holotype: GI SPS 100/1201) |
Late Cretaceous (Campanian, ~75 Ma) | Height: ~0.6 m
Length: ~1.8–3.0 m Mass: ~40–45 kg |
Formation: Barun Goyot Formation, Mongolia | "The 'even head'! Featuring a flat, heavily ossified skull table and an unusually wide, basket-like pelvis that hints it might have given birth to live young or large clutches." |
| Micropachycephalosaurus hongtuyanensis
(Holotype: IVPP V4688) |
Late Cretaceous (Campanian, ~83–70 Ma) | Height: ~0.3 m
Length: ~1.0 m Mass: ~5 kg |
Formation: Wangshi Group, China | "Winner of the longest dinosaur name award! Despite its grandiose title, it's known from very fragmentary remains, but it represents the tiny, twig-walking ancestors of the clade." |
| Pachycephalosaurus wyomingensis
(Holotype: USNM 12031) |
Late Cretaceous (Maastrichtian, ~68–66 Ma) | Height: ~2.0 m
Length: ~4.5–4.5 m Mass: ~300–450 kg |
Formation: Hell Creek / Lance Formation, USA | "The thick-headed king of the Cretaceous! With a solid bone dome ten inches thick on top of its skull, it likely engaged in dramatic flank-butting or head-shoving duels for dominance." |
| Prenocephale prenes
(Holotype: GI SPS 100/1001) |
Late Cretaceous (Campanian–Maastrichtian, ~70 Ma) | Height: ~0.8 m
Length: ~2.4 m Mass: ~60 kg |
Formation: Nemegt Formation, Mongolia | "Slender and smart, with a dome-shaped head optimized for high-speed visual displays and social sparring across the Asian floodplains." |
| Stegoceras validum
(Holotype: UALVP 2) |
Late Cretaceous (Campanian, ~75–74 Ma) | Height: ~0.7 m
Length: ~2.0–2.5 m Mass: ~40–50 kg |
Formation: Dinosaur Park Formation, Canada | "The classic Canadian dome-head! Its pear-shaped skull and serrated cheek teeth show it was browsing on tender fruits, seeds, and foliage." |
| Stygimoloch spinifer
(Holotype: UCMP 119684) |
Late Cretaceous (Maastrichtian, ~66 Ma) | Height: ~1.5 m
Length: ~3.0 m Mass: ~80–100 kg |
Formation: Hell Creek Formation, USA | "Demon from the river Styx! Those long, intimidating horns ringing its domed skull made it look like a heavy-metal album cover brought to life." |
| Wannanosaurus yansiensis
(Holotype: IVPP V4731) |
Late Cretaceous (Campanian, ~80 Ma) | Height: ~0.3 m
Length: ~0.6–1.0 m Mass: ~2–3 kg |
Formation: Xiaoyan Formation, China | "One of the oldest and smallest known pachycephalosaurs from southern China, giving us clues into how these miniaturized dome-heads first evolved." |
Ceratopsia Scientific Catalog
| Taxon & Specimen | Age & Time Period | Dimensions (Hip Height, Length, Mass) | Location Formation | Teodora Villavicencio's Comments (Legend Quest: Master of Myth) (VO: Annemarie Blanco) |
| Auroraceratops rugosus
(Holotype: Z LPM 1-0001) |
Early Cretaceous (Aptian–Albian, ~125–100 Ma) | Height: ~0.4 m
Length: ~1.25–2.0 m Mass: ~15–30 kg |
Formation: Xiagou Formation, China | "Named after the dawn and the Roman goddess Aurora! Its deeply textured, rugged snout bones show that early basal ceratopsians were already using facial displays." |
| Bagaceratops rozhdestvenskyi
(Holotype: ZPAL MgD-II/1) |
Late Cretaceous (Campanian–Maastrichtian, ~80–70 Ma) | Height: ~0.3 m
Length: ~1.0 m Mass: ~22 kg |
Formation: Djadokhta Formation, Mongolia | "A small, smooth-skulled desert dweller from the Gobi! It represents a charming little branch of the horned-dinosaur family tree before mega-frills took over." |
| Centrosaurus apertus
(Holotype: NMC 971) |
Late Cretaceous (Campanian, ~76.5–75.5 Ma) | Height: ~1.8 m
Length: ~6.0 m Mass: ~2.3 metric tons |
Formation: Dinosaur Park Formation, Canada | "That massive, forward-curving nose horn and the wicked, hook-like spikes radiating from its frill made it look like a walking crown of thorns!" |
| Chasmosaurus belli
(Holotype: NMC 491) |
Late Cretaceous (Campanian, ~76–75 Ma) | Height: ~2.0 m
Length: ~4.8–5.0 m Mass: ~1.5–2.0 metric tons |
Formation: Dinosaur Park Formation, Canada | "The wide-frilled beauty! Its elongated, heart-shaped frill was packed with large window-like openings, likely used for species recognition and sun-basking rather than defense." |
| Leptoceratops gracilis
(Holotype: NMC 8887) |
Late Cretaceous (Maastrichtian, ~68–66 Ma) | Height: ~0.6 m
Length: ~2.0 m Mass: ~68–90 kg |
Formation: Edmonton Group / Scollard Formation, Canada | "A slender, toothless-beaked primitive ceratopsian that managed to stick around right until the very end of the Cretaceous period." |
| Lokiceratops rangiformis
(Holotype: MSM P43231) |
Late Cretaceous (Campanian, ~78 Ma) | Height: ~2.2 m
Length: ~6.7 m Mass: ~5.0 metric tons |
Formation: Judith River Formation, USA | "Named after the Norse god Loki! Featuring the most wildly asymmetric, blade-like horns and frill ornaments ever discovered on a horned dinosaur." |
| Microceratus gobiensis
(Holotype: PIN 3146/1) |
Late Cretaceous (Santonian–Campanian, ~85–75 Ma) | Height: ~0.2 m
Length: ~0.6 m Mass: ~1–2 kg |
Formation: Djadokhta Formation, Mongolia | "'Small horned face'! A tiny, agile herbivore scurrying through the prehistoric Gobi dunes like a scaled rabbit." |
| Montanoceratops cerorhynchus
(Holotype: AMNH 5462) |
Late Cretaceous (Campanian, ~70 Ma) | Height: ~0.8 m
Length: ~2.5 m Mass: ~90–170 kg |
Formation: St. Mary River Formation, USA | "Montana's very own horned oddity! Sporting a distinct, beak-like snout and a tiny nasal horn that hinted at the massive weaponry to come." |
| Nasutoceratops titusi
(Holotype: UMNH VP 16800) |
Late Cretaceous (Campanian, ~75 Ma) | Height: ~1.8 m
Length: ~4.5–5.0 m Mass: ~1.5 metric tons |
Formation: Kaiparowits Formation, USA | "Big-nosed horned face! Those insanely long, curved brow horns look straight out of a Texas longhorn steer, sweeping sideways to intimidate rivals." |
| Pachyrhinosaurus lakustai
(Holotype: TMP 89.132.1) |
Late Cretaceous (Campanian–Maastrichtian, ~73.5 Ma) | Height: ~2.0 m
Length: ~6.0–8.0 m Mass: ~3.0–4.0 metric tons |
Formation: Wapiti / Frenchman Formation, Canada / Hell Creek Formation, USA | "Instead of a sharp horn on its nose, it grew a massive, bumpy bone boss! Perfect for head-to-head shoving matches in the ancient Arctic mists." |
| Pentaceratops sternbergii
(Holotype: AMNH 1625) |
Late Cretaceous (Campanian, ~75–73 Ma) | Height: ~2.5 m
Length: ~6.0–8.0 m Mass: ~2.5–5.0 metric tons |
Formation: Kirtland Formation, USA | "Five-horned face! Well, technically two brow horns, two cheek horns, and a nose horn. It rocked one of the largest skull frills of any land animal in history." |
| Protoceratops hellenikorhinus
(Holotype: IMM 95BM1) |
Late Cretaceous (Campanian, ~75–71 Ma) | Height: ~0.6 m
Length: ~1.8–2.0 m Mass: ~80–180 kg |
Formation: Bayan Mandahu Formation, China | "The quintessential Gobi desert fossil! Famous for being found in pristine nesting grounds, cementing its legacy as a doting parent of the Cretaceous." |
| Psittacosaurus meileyingensis
(Holotype: IVPP V 7389) |
Early Cretaceous (Aptian, ~120–110 Ma) | Height: ~0.4 m
Length: ~1.0–2.0 m Mass: ~10–20 kg |
Formation: Ejinhoro Formation, China | "Parrot lizard! Complete with a high-curved beak, quill-like bristles on its tail, and gastroliths in its stomach to grind down tough ferns." |
| Sinoceratops zhuchengensis
(Holotype: ZCDM V0010) |
Late Cretaceous (Campanian, ~73 Ma) | Height: ~2.5 m
Length: ~6.0–7.0 m Mass: ~2.0 metric tons |
Formation: Wangshi Group, China | "China's magnificent centrosaurine! The only known horned dinosaur of its specific branch found outside of North America, sporting a gorgeous array of forward-curving frill hooks." |
| Styracosaurus ovatus
(Holotype: USNM 11869) |
Late Cretaceous (Campanian, ~75 Ma) | Height: ~1.8 m
Length: ~5.0–5.5 m Mass: ~2.7 metric tons |
Formation: Two Medicine Formation, USA | "A brilliant cousin to the classic Canadian Styracosaurus, marching across the southern ranges of the North American inland sea with a bristling halo of spikes." |
| Torosaurus latus
(Holotype: YPM 1830) |
Late Cretaceous (Maastrichtian, ~68–66 Ma) | Height: ~2.4 m
Length: ~7.6–9.0 m Mass: ~4.0–6.0 metric tons |
Formation: Hell Creek / Lance Formation, USA / Frenchman Formation, Canada | "Bull lizard! Boasting the largest skull of any known land vertebrate ever—its frill alone could span over eight feet long!" |
| Triceratops horridus
(Holotype: USNM 4842) |
Late Cretaceous (Maastrichtian, ~68–66 Ma) | Height: ~2.9–3.0 m
Length: ~8.0–9.0 m Mass: ~6.0–12.0 metric tons |
Formation: Hell Creek / Lance Formation, USA | "The ultimate three-horned face! With a battery of hundreds of self-sharpening teeth and triple-spear headgear, it stood its ground against T. rex until the very end." |
Stegosauria Scientific Catalog
| Taxon & Specimen | Age & Time Period | Dimensions (Hip Height, Length, Mass) | Location Formation | Teodora Villavicencio's Comments (Legend Quest: Master of Myth) (VO: Annemarie Blanco) |
| Chungkingosaurus jiangbeiensis
(Holotype: CV 0072) |
Late Jurassic (Oxfordian–Kimonian, ~160–155 Ma) | Height: ~1.2 m
Length: ~3.0–4.0 m Mass: ~400–800 kg |
Formation: Shaximiao Formation, China | "A smaller, feisty Chinese stegosaur! Packing an unusually large array of paired tail spikes known as a thagomizer, perfect for close-quarters self-defense." |
| Dacentrurus armatus
(Holotype: BMNH R4601) |
Late Jurassic (Kimmeridgian–Tithonian, ~154–150 Ma) | Height: ~2.0 m
Length: ~7.0–8.0 m Mass: ~5.0 metric tons |
Formation: Kimmeridge Clay Formation, England | "Europe's heavy armor! Instead of towering upright plates, it sported enormous, menacing spikes running all along its back and tail like a walking medieval fortress." |
| Gigantspinosaurus sichuanensis
(Holotype: ZDM 0018) |
Late Jurassic (Oxfordian, ~160 Ma) | Height: ~1.4 m
Length: ~4.2 m Mass: ~700 kg |
Formation: Shaximiao Formation, China | "Look at those ridiculously enlarged, wing-like shoulder spines! They stuck straight out from its scapulae, making it one of the most uniquely spiky dinosaurs in Sichuan." |
| Huayangosaurus taibaii
(Holotype: IVPP V.6728) |
Middle Jurassic (Bathonian–Callovian, ~165 Ma) | Height: ~1.0 m
Length: ~4.5 m Mass: ~300–500 kg |
Formation: Shaximiao Formation, China | "A foundational primitive stegosaur! It even retained premaxillary teeth in its upper jaw—something its later, more specialized cousins completely lost over time." |
| Kentrosaurus aethiopicus
(Holotype: MB.R.1930) |
Late Jurassic (Kimmeridgian, ~152 Ma) | Height: ~1.5 m
Length: ~4.5–5.0 m Mass: ~1.0–1.5 metric tons |
Formation: Tendaguru Formation, Tanzania | "The African spiked slider! With flat plates across its neck and long, dagger-like spikes trailing all the way down its tail and hips. A true architectural marvel of Tanzania." |
| Stegosaurus stenops
(Holotype: USNM 4934) |
Late Jurassic (Kimmeridgian–Tithonian, ~155–150 Ma) | Height: ~5.75 m
Length: ~8.5–10.5 m Mass: ~2.6–4.7 metric tons |
Formation: Morrison Formation, USA | "The ultimate roofed lizard! Those alternating double rows of bony plates on its back acted as thermal radiators and dazzling display structures against hungry Morrison allosaurs." |
| Tuojiangosaurus multispinus
(Holotype: CV V205) |
Late Jurassic (Oxfordian–Kimmeridgian, ~155 Ma) | Height: ~2.0 m
Length: ~6.5–7.0 m Mass: ~1.5–2.0 metric tons |
Formation: Shaximiao Formation, China | "Asia's classic multi-spined stegosaur! Featuring narrow, pear-shaped back plates and a powerful tail thagomizer that kept local carnivores guessing." |
Ankylosauria Scientific Catalog
| Taxon & Specimen | Age & Time Period | Dimensions (Hip Height, Length, Mass) | Location Formation | Teodora Villavicencio's Comments (Legend Quest: Master of Myth) (VO: Annemarie Blanco) |
| Ankylosaurus magniventris
(Holotype: AMNH 5895) |
Late Cretaceous (Maastrichtian, ~68–66 Ma) | Height: ~3.7 m
Length: ~6.25–11.0 m Mass: ~4.8–8.0 metric tons |
Formation: Hell Creek / Lance Formation, USA / Scollard Formation, Canada | "The fused lizard with the great belly! Packing a massive bony club on its tail that could shatter a T. rex's shin bone with a single swing. The ultimate tank of the Cretaceous!" |
| Euoplocephalus tutus
(Holotype: NMC 0210) |
Late Cretaceous (Campanian, ~76.5–67 Ma) | Height: ~1.5 m
Length: ~6.0–7.0 m Mass: ~2.0–2.5 metric tons |
Formation: Dinosaur Park Formation, Canada | "Well-armored and completely protected! Even its eyelids were covered in bony armor plates. When predators closed in, it dropped flat and became an unbiteable boulder." |
| Minmi paravertebra
(Holotype: QM F10329) |
Early Cretaceous (Aptian–Albian, ~120–110 Ma) | Height: ~0.4 m
Length: ~2.0–3.0 m Mass: ~300 kg |
Formation: Bungil Formation, Australia | "Australia's adorable little armored road-roller! Featuring horizontal bony rods along its spine that gave it unique spinal rigidity against local predators." |
| Nodosaurus textilis
(Holotype: YPM 1815) |
Early Cretaceous (Albian, ~105–100 Ma) | Height: ~1.2 m
Length: ~5.5–6.0 m Mass: ~1.5–3.0 metric tons |
Formation: Dakota / Mowry Shale Formation, USA | "The classic knot-lizard! Lacking a tail club, it relied instead on dense rows of interlocking osteoderms and menacing shoulder spikes for formidable defense." |
| Pinacosaurus grangeri
(Holotype: AMNH 6523) |
Late Cretaceous (Campanian, ~80–75 Ma) | Height: ~1.0 m
Length: ~4.5–5.0 m Mass: ~1.0–1.9 metric tons |
Formation: Djadokhta Formation, Mongolia / China | "Plank lizard of the Gobi! Famous for fossilized juvenile bonebeds that suggest these armored youngsters huddled together during desert dust storms." |
| Polacanthus foxii
(Holotype: BMNH R175) |
Early Cretaceous (Barremian, ~130–125 Ma) | Height: ~1.0 m
Length: ~4.0–5.0 m Mass: ~1.0–2.0 metric tons |
Formation: Wessex Formation, England | "A stunning British nodosaurid! Sporting a massive, heavy sacral shield over its hips and curved lateral spikes that made it a prickly hazard for European predators." |
| Sauropelta edwardsorum
(Holotype: AMNH 3032) |
Early Cretaceous (Aptian–Albian, ~115–110 Ma) | Height: ~1.5 m
Length: ~5.0–7.6 m Mass: ~1.5–2.0 metric tons |
Formation: Cloverly Formation, USA | "Look at those colossal, curved neck spikes sticking out like horns! This early North American nodosaurid was built to withstand the sharpest teeth of the Early Cretaceous." |
| Scelidosaurus harrisonii
(Holotype: BMNH R1111) |
Early Jurassic (Sinemurian, ~193 Ma) | Height: ~1.0 m
Length: ~4.0 m Mass: ~250–450 kg |
Formation: Charmouth Mudstone Formation, England | "The limb-lizard pioneer! One of the earliest and most complete armored dinosaurs ever discovered, bridging the gap between primitive ornithischians and full thyreophorans." |
| Scutellosaurus lawleri
(Holotype: MNA V175) |
Early Jurassic (Hettangian, ~196 Ma) | Height: ~0.3 m
Length: ~1.2 m Mass: ~3–10 kg |
Formation: Kayenta Formation, USA | "Little shield lizard! A tiny, long-tailed bipedal precursor covered in hundreds of small osteoderms, showing how armoring started on a miniature scale." |
| Talarurus plicatospineus
(Holotype: PIN 3780-1) |
Late Cretaceous (Coniacian–Santonian, ~89–83 Ma) | Height: ~1.2 m
Length: ~5.0–6.0 m Mass: ~1.5 metric tons |
Formation: Bayan Shireh Formation, Mongolia | "Basket-tail! Named for its complex woven network of bony tail reinforcement plates and a sturdy terminal club for swinging at unruly predators." |
Pterosauria Scientific Catalog
| Taxon & Specimen | Age & Time Period | Dimensions (Wingspan / Hip Height, Length, Mass) | Location Formation | Teodora Villavicencio's Comments (Legend Quest: Master of Myth) (VO: Annemarie Blanco) |
| Anurognathus ammoni
(Holotype: BSP 1922 I 42) |
Late Jurassic (Tithonian, ~150 Ma) | Wingspan: ~0.35 m
Length: ~0.09 m Mass: ~20–40 g |
Formation: Solnhofen Limestone, Germany | "The tiny, frog-mouthed aerial hunter! With a short skull and wide gape, it swooped through Jurassic forests snapping up insects like a prehistoric bat." |
| Dimorphodon macronyx
(Holotype: BMNH R1034) |
Early Jurassic (Sinemurian, ~195–190 Ma) | Wingspan: ~1.4 m
Length: ~1.0 m Mass: ~1.5–2.0 kg |
Formation: Blue Lias / Lower Lias, England | "Two forms of teeth! Featuring a massive, deep skull and a long, stiffened tail balanced with a terminal vane like an arrow feather." |
| Eudimorphodon ranzii
(Holotype: MCSN 1770) |
Late Triassic (Norian, ~215 Ma) | Wingspan: ~1.0 m
Length: ~0.65 m Mass: ~150 g |
Formation: Zorzino Limestone, Italy | "One of the oldest and most tooth-packed pterosaurs known! Those multi-cusped teeth were wicked little fish-traps over ancient Alpine lagoons." |
| Rhamphorhynchus etchesi (or R. muensteri)
(Specimen: BMNH 37002) |
Late Jurassic (Kimmeridgian–Tithonian, ~150 Ma) | Wingspan: ~1.0–1.8 m
Length: ~1.26 m Mass: ~400–800 g |
Formation: Solnhofen Limestone, Germany | "The quintessential long-tailed flyer! That stiff rudder at the end of its tail kept it perfectly balanced during high-speed banking turns over Jurassic archipelagos." |
| Scaphognathus crassirostris
(Holotype: BSP AS VII 648) |
Late Jurassic (Kimmeridgian–Tithonian, ~150 Ma) | Wingspan: ~0.9 m
Length: ~0.6 m Mass: ~300 g |
Formation: Solnhofen Limestone, Germany | "Thick-jawed snout! Its blunt, rounded skull profile gave it a very different bite compared to its needle-toothed Rhamphorhynchoid cousins." |
| Arthurdactylus conandoylei
(Holotype: CPV 296) |
Early Cretaceous (Aptian, ~115 Ma) | Wingspan: ~4.6 m
Length: ~2.1 m Mass: ~10 kg |
Formation: Romualdo Formation, Brazil | "Named after Sir Arthur Conan Doyle and his Lost World! A gorgeous Brazilian ornithocheiroid with massive wing bones sweeping across the skies." |
| Caiuajara dobruskii
(Holotype: CP-V 1001) |
Late Cretaceous (Cenomanian–Turonian, ~90 Ma) | Wingspan: ~0.65–2.35 m
Length: ~1.0 m Mass: ~2.0 kg |
Formation: Goioerê Formation, Brazil | "Discovered in a massive fossil bonebed containing dozens of individuals! Proving that these tapejarids lived, nested, and flew in large, social colonial flocks." |
| Cearadactylus atrox
(Holotype: MN 5004-V) |
Early Cretaceous (Aptian, ~112 Ma) | Wingspan: ~4.0 m
Length: ~1.5 m Mass: ~6.0 kg |
Formation: Romualdo Formation, Brazil | "Fierce jaws from Ceará! Its interlocking, rosette-tipped teeth were custom-built to grip slippery fish swimming through tropical Cretaceous seas." |
| Ctenochasma elegans
(Holotype: BSP AS I 1045) |
Late Jurassic (Tithonian, ~150 Ma) | Wingspan: ~0.25–0.4 m
Length: ~0.3 m Mass: ~40 g |
Formation: Solnhofen Limestone, Germany | "The comb-jawed filter feeder! Lined with hundreds of hair-thin, needle-like teeth that strained tiny crustaceans out of shallow Jurassic waters like a living sieve." |
| Dsungaripterus weii
(Holotype: IVPP V.277) |
Early Cretaceous (Valanginian–Aptian, ~130–112 Ma) | Wingspan: ~3.0–3.5 m
Length: ~1.9 m Mass: ~9.0–13 kg |
Formation: Tugulu Group, China | "An armored-skulled shell-cracker! With a low, bony crest and flat, peg-like back teeth designed for crushing hard-shelled clams and crabs along inland lake basins." |
| Ornithocheirus simus
(Holotype: NHMUK 35412) |
Early Cretaceous (Albian, ~110 Ma) | Wingspan: ~5.0 m
Length: ~2.0 m Mass: ~15 kg |
Formation: Cambridge Greensand, England | "The bird-hand of England! Famous for its distinctive, keel-like expansion on the tip of its upper snout used to slice through water spray during low-altitude fishing." |
| Pteranodon sternbergi
(Holotype: FHSM VP 403) |
Late Cretaceous (Coniacian–Santonian, ~85 Ma) | Wingspan: ~4.0–7.2 m
Length: ~1.8 m Mass: ~20–30 kg |
Formation: Niobrara Formation, USA | "The iconic soaring glider of the Western Interior Seaway! That sweeping upright crest served as an aerodynamic rudder while cruising over prehistoric waves." |
| Pterodaustro guinazui
(Holotype: PVL 2571) |
Early Cretaceous (Albian, ~105 Ma) | Wingspan: ~2.5 m
Length: ~1.0 m Mass: ~2.0–3.0 kg |
Formation: La Amarga / Lagarcito Formation, Argentina | "Look at those upward-curving bristle teeth on its lower jaw! It skimmed the water like a giant prehistoric flamingo, filtering microscopic organisms." |
| Quetzalcoatlus lawsoni
(Holotype: TMM 41961-1) |
Late Cretaceous (Maastrichtian, ~68–66 Ma) | Wingspan: ~5.0–25.5 m
Length: ~3.0–14.0 m Mass: ~65–850,000 kg |
Formation: Javelina Formation, USA | "The smaller cousin of the giant apex sky-lord! Even at 83 feet across, it stalked Cretaceous floodplains on stilt-like legs hunting small prey like a giant stork." |
| Tapejara wellnhoferi
(Holotype: BSP 1993 I 3) |
Early Cretaceous (Aptian, ~115–110 Ma) | Wingspan: ~1.5–2.5 m
Length: ~0.8 m Mass: ~3.0 kg |
Formation: Romualdo Formation, Brazil | "The parrot-beaked navigator! Sporting a massive, semi-circular bony and soft-tissue sagittal crest that made its head look remarkably like an exotic tropical bird." |
| Tropeognathus mesembrinus
(Holotype: BSP 1987 I 47) |
Early Cretaceous (Aptian, ~112 Ma) | Wingspan: ~8.2 m
Length: ~3.0 m Mass: ~35–50 kg |
Formation: Romualdo Formation, Brazil | "Keel-jawed titan of the southern seas! With massive semi-circular crests on the top and bottom of its snout to minimize hydrodynamic drag while dipping for fish." |
Marine Reptiles & Prehistoric Megafauna Scientific Catalog
| Taxon & Specimen | Age & Time Period | Dimensions (Flippers / Height, Length, Mass) | Location Formation | Teodora Villavicencio's Comments (Legend Quest: Master of Myth) (VO: Annemarie Blanco) |
| Mesosaurus tenuidens
(Holotype: MNHN 1900-1) |
Early Permian (Artinskian, ~290–275 Ma) | Height / Width: ~0.1 m
Length: ~1.0 m Mass: ~3–5 kg |
Formation: Irati Formation, Brazil / Whitehill Formation, South Africa | "A tiny, slender pioneer of the aquatic realm! Its long, needle-filled snout acted like a fine-toothed comb to strain tiny swimming crustaceans in inland Permian lakes." |
| Nothosaurus giganteus
(Holotype: SMNS 5932) |
Middle Triassic (Anisian–Ladinian, ~240–230 Ma) | Height / Width: ~0.8 m
Length: ~4.0–5.2 m Mass: ~200–500 kg |
Formation: Muschelkalk, Germany / Grenzbitumen Zone, Switzerland | "The ultimate semi-aquatic ambush predator! With webbed feet and interlocking needle teeth, it hunted like a prehistoric seal along the margins of the Tethys Sea." |
| Eurhinosaurus huenei
(Holotype: GPIM 1324) |
Early Jurassic (Toarcian, ~182–175 Ma) | Height / Width: ~1.5 m
Length: ~6.0–7.0 m Mass: ~1.0 metric ton |
Formation: Posidonia Shale, Germany | "Look at that bizarre, exaggerated upper bill! It was twice as long as the lower jaw and lined with teeth, used to slash through schools of ancient squid and fish." |
| Ichthyosaurus conybeari
(Holotype: BMNH 2149) |
Early Jurassic (Sinemurian–Pliensbachian, ~199–189 Ma) | Height / Width: ~1.0 m
Length: ~2.0 m Mass: ~90–100 kg |
Formation: Blue Lias Formation, England | "The classic 'fish lizard'! Streamlined like a dolphin with giant, dinner-plate eyes that peered into the dark, murky depths of the Early Jurassic seas." |
| Ophthalmosaurus icenicus
(Holotype: CAMSM J35160) |
Late Jurassic (Kimmeridgian–Tithonian, ~165–150 Ma) | Height / Width: ~1.2 m
Length: ~4.0–6.0 m Mass: ~900–1,000 kg |
Formation: Oxford Clay / Kimmeridge Clay, England | "Eye lizard supreme! Those massive, scleral-ringed eyes were larger than dinner plates, built for deep-diving hunts in total darkness after squids and cephalopods." |
| Shonisaurus popularis
(Holotype: USNM 21103) |
Late Triassic (Norian, ~210 Ma) | Height / Width: ~3.0 m
Length: ~15.0 m Mass: ~30.0 metric tons |
Formation: Luning Formation, Nevada, USA | "Nevada's colossal Triassic leviathan! One of the very first giant ichthyosaurs, moving through ancient deep waters with massive, whale-like grace." |
| Attenborosaurus conybeari
(Holotype: BMNH R1338) |
Early Jurassic (Sinemurian, ~195 Ma) | Height / Width: ~2.0 m
Length: ~5.0 m Mass: ~500 kg |
Formation: Charmouth Mudstone Formation, England | "Named after the legendary Sir David Attenborough! A stunning, short-necked plesiosaur with beautifully preserved skin impressions found in the UK." |
| Cryptoclidus richardsoni
(Holotype: CAMSM J.46988) |
Late Jurassic (Callovian, ~165–160 Ma) | Height / Width: ~1.5 m
Length: ~3.0–4.0 m Mass: ~800 kg |
Formation: Oxford Clay Formation, England | "Hidden clavicle! Featuring a flexible, slender neck and a mouth full of interlocking teeth designed to sweep through the sea floor scooping up soft prey." |
| Dolichorhynchops herschelensis
(Holotype: TMP 89.36.1) |
Late Cretaceous (Campanian, ~80–75 Ma) | Height / Width: ~1.2 m
Length: ~3.0–3.5 m Mass: ~300–400 kg |
Formation: Bearpaw Formation, Canada / Niobrara, USA | "Long-nosed face! A nimble, short-necked polycotylid pliosaur that zoomed through the Western Interior Seaway snapping up fast fish." |
| Elasmosaurus platyurus
(Holotype: ANSP 10081) |
Late Cretaceous (Campanian, ~80.5 Ma) | Height / Width: ~2.5 m
Length: ~10.3–14.0 m Mass: ~2.0–3.0 metric tons |
Formation: Pierre Shale, USA | "Neck-lizard extraordinaire! With over 70 vertebrae making up half its total length, its body was essentially a floating submarine beneath that snake-like neck." |
| Kronosaurus queenslandicus
(Holotype: QMF 1819) |
Early Cretaceous (Albian, ~120–100 Ma) | Height / Width: ~3.0 m
Length: ~9.0–10.5 m Mass: ~10.6–12.0 metric tons |
Formation: Wallumbilla Formation / Toolebuc Formation, Australia | "Named after Kronos the Titan! Boasting a skull over nine feet long packed with banana-sized teeth capable of crushing any marine rival in the Australian inland seas." |
| Liopleurodon ferox
(Holotype: Specimen lost; neotype OUMNH J.27245) |
Late Jurassic (Callovian–Kimmeridgian, ~160–155 Ma) | Height / Width: ~2.5 m
Length: ~5.0–7.0 m Mass: ~1.0–1.7 metric tons |
Formation: Oxford Clay Formation, England / France | "Smooth-sided teeth! The apex terror of the Jurassic Oxfordian seas, sweeping its massive flippers to ambush prey with terrifying speed." |
| Plesiosaurus dolichodeirus
(Holotype: NHMUK R1336) |
Early Jurassic (Sinemurian, ~199–190 Ma) | Height / Width: ~1.5 m
Length: ~3.5 m Mass: ~450 kg |
Formation: Blue Lias Formation, England | "The classic fossil that started the plesiosaur craze! Mary Anning found specimens that showed the world how these four-flippered swimmers navigated ancient waters." |
| Trinacromerum kirki
(Holotype: NMC 1494) |
Late Cretaceous (Cenomanian–Turonian, ~95–90 Ma) | Height / Width: ~1.2 m
Length: ~3.0 m Mass: ~250 kg |
Formation: Carlile Shale / Dakota Formation, USA | "Three-pointed femur! A sleek, torpedo-bodied pliosaur built for fast acceleration while chasing schools of ancient fish." |
| Clidastes propython
(Holotype: YPM 1297) |
Late Cretaceous (Coniacian–Campanian, ~87–82 Ma) | Height / Width: ~0.6 m
Length: ~2.0–4.0 m Mass: ~50–100 kg |
Formation: Niobrara Formation, USA | "The smallest and most slender mosasaur! It slithered through coastal shallows like an aquatic monitor lizard, hunting fish with lightning speed." |
| Jormungandr walhallaensis
(Holotype: UND 11129) |
Late Cretaceous (Campanian, ~80 Ma) | Height / Width: ~0.8 m
Length: ~7.0 m Mass: ~800 kg |
Formation: Pembina Member / Pierre Shale, USA | "Named after the Midgard serpent from Norse mythology! A transitionary mosasaur showing key evolutionary links between smaller and giant forms." |
| Megalania priscus (Varanus priscus)
(Syntype specimens) |
Pleistocene (Early–Late Pleistocene, ~1.5 Ma – 50,000 years ago) | Height / Width: ~1.0 m
Length: ~5.5–7.0 m Mass: ~500–1,940 kg |
Formation: Pleistocene Alluvial Deposits, Australia | "The giant Australian land monitor! While not strictly marine, this colossal terrestrial apex predator ruled the Outback rivers and billabongs alongside early humans." |
| Mosasaurus beaugei
(Specimen specimens from phosphates) |
Late Cretaceous (Maastrichtian, ~70–66 Ma) | Height / Width: ~3.0 m
Length: ~12.0–15.0 m Mass: ~14.0 metric tons |
Formation: Oulad Abdoun Basin, Morocco | "The Moroccan ocean lord! A massive, heavy-skulled apex mosasaur that ruled the shallow phosphate seas of North Africa right up to the end of the Cretaceous." |
| Tylosaurus bernardi
(Holotype: IRSNB R22) |
Late Cretaceous (Campanian–Maastrichtian, ~85–66 Ma) | Height / Width: ~3.0 m
Length: ~12.0–14.0 m Mass: ~10.0–12.0 metric tons |
Formation: Niobrara / Pierre Shale, USA / Smoky Hill Chalk | "The battering ram of the Western Interior Seaway! Sporting an elongated, bone-reinforced snout used to ram and stun rival marine reptiles before devouring them." |
| Dunkleosteus amblyodoratus
(Holotype: CMNH specimens) |
Late Devonian (Frasnian–Famennian, ~380–358 Ma) | Height / Width: ~3.2 m
Length: ~4.0–14.0 m Mass: ~30.0 metric tons |
Formation: Cleveland Shale / Ohio Shale, USA | "The armored terror of the Devonian! Instead of teeth, it possessed self-sharpening bony jaw plates that could slice through shark armor like paper." |
| Otodus megalodon
(Syntype dental specimens) |
Miocene–Pliocene (Burdigalian–Piacenzian, ~23–3.6 Ma) | Height / Width: ~3.5 m (fin height)
Length: ~15.0–20.0 m Mass: ~50.0–60.0 metric tons |
Formation: Global marine deposits (Calvert Cliffs, USA; Gatun Formation, Panama) | "The undisputed megatooth superstar of the prehistoric oceans! A colossal, whale-hunting shark that dominated the global seas before fading into extinction." |
Synapsids & Prehistoric Mammals Scientific Catalog
| Taxon & Specimen | Age & Time Period | Dimensions (Height, Length, Mass) | Location Formation | Teodora Villavicencio's Comments (Legend Quest: Master of Myth) (VO: Annemarie Blanco) |
| Dimetrodon grandis
(Holotype: MCZ 1351) |
Early Permian (Cisuralian, ~298–272 Ma) | Height / Sail: ~1.0–1.7 m
Length: ~3.2–3.5 m Mass: ~110–250 kg |
Formation: Clear Fork / Arroyo Formation, USA | "Not a dinosaur! This magnificent sail-backed synapsid is actually more closely related to you and me than to T. rex. That giant neural-spine sail was likely used for thermoregulation and visual displays!" |
| Bulbasaurus phylloxyron
(Holotype: BP/1/7454) |
Late Permian (Lopingian, ~255 Ma) | Height: ~0.25 m
Length: ~0.6–1.0 m Mass: ~10–15 kg |
Formation: Teekloof Formation / Beaufort Group, South Africa | "Named after the Pokémon Bulbasaur because of its bulbous, leaf-cutting snout! A charming little dicynodont with tusk-like premaxillae that browsed on late Permian foliage." |
| Lystrosaurus curvatus
(Holotype: AMNH 5556) |
Late Permian to Early Triassic (~252–247 Ma) | Height: ~0.3–0.4 m
Length: ~0.6–1.2 m Mass: ~10–40 kg |
Formation: Fremouw Formation, Antarctica / Beaufort Group, South Africa | "The ultimate survivor of the End-Permian extinction! This barrel-chested, shovel-beaked dicynodont made up over 90 percent of all land vertebrate fossils in some Triassic layers." |
| Alphadon halleyi
(Holotype: UCMP 50570) |
Late Cretaceous (Maastrichtian, ~70–66 Ma) | Height / Width: ~0.05 m
Length: ~0.15–0.2 m Mass: ~50–100 g |
Formation: Hell Creek / Lance Formation, USA | "A tiny, shrew-like metatherian mammal scurrying underfoot while Triceratops and T. rex walked the earth! Proving that our furry mammalian ancestors were right there in the shadow of the dinosaurs." |
References
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