Prehistoric list
From EverybodyWiki Bios & Wiki
Several books share or closely match the name "Prehistoric Planet". Depending on whether you are looking for an extension of the popular BBC / Apple TV+ docuseries or a specific children's book, you are likely looking for one of the following: [1]
1. Documentaries & Companion Books
While the Prehistoric Planet series narrated by Sir David Attenborough does not have an exactly named "Prehistoric Planet" tie-in book, viewers frequently look for these closely related official companions:
- Life on Our Planet by Dr. Tom Fletcher: The official hardcover companion book to the groundbreaking prehistoric Netflix series. It is highly recommended if you love the cinematic, photo-real style of Prehistoric Planet, as it features over 200 photos, scientific breakdowns, and CGI reconstructions.
- Our Planet by Alastair Fothergill: The official companion book to the broader Attenborough nature documentary project.
2. Children's Books
If you are looking for specific books with this exact title, there are a few highly rated options across different age groups:
- Our Prehistoric Planet: Dinosaurs and Other Creatures of the Past (Ages 2–5) Written by Sue Lowell Gallion, this unique board book features beautiful rhyming verse and fold-out pages that transform the book into a free-standing globe. It takes young kids on a chronological journey from early ocean life to the age of dinosaurs. [1, 2]
- One Day on Our Prehistoric Planet... With a T. Rex (Ages 3–7) Part of a popular educational series by Ella Bailey, this picture book follows the daily life of a baby Tyrannosaurus rex and its family as they navigate their ancient environment. [1]
- The Prehistoric Planet (Galaxy Zack #3) (Ages 5–9) An illustrated sci-fi chapter book by Ray O'Ryan. It follows a young boy named Zack who goes on an outer-space adventure to return a baby pterosaur to its home world, the "Prehistoric Planet".
Which of these versions were you looking for? If you are looking for a specific book format (like a coffee table book, a graphic novel, or a toddler book), let me know so I can give you the direct link to buy it or find the exact author you need.
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) | ~1,000–6,500 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) |
Giant Chart
| Family / Genus & Species | Name Meaning / Etymology | Height / Length / Mass | Clade / Suborder | Temporal Range | Location & Formations | Key Anatomical & Ecological Notes | Teodora’s Comments |
|---|---|---|---|---|---|---|---|
| Hominidae — Human (Homo sapiens) | Homo = human; sapiens = wise | ~1.5–1.9 m tall; ~1.4–2.0 m long; ~45–100+ kg | Mammalia → Primates → Hominidae | ~300 ka–present | Worldwide | Bipedal primate; highly developed brain; tool use and complex culture | “Humans may look ordinary, but their ability to learn, invent, and change their surroundings is extraordinary!” |
| Hominidae — Gigantopithecus blacki | “Giant ape”; blacki honors Davidson Black | ~2.5–3.0 m estimated; mass perhaps ~200–300+ kg | Mammalia → Primates → Hominidae | Pleistocene, ~2.0–0.3 Ma | China; cave deposits including Guangxi | Largest known ape; enormous jaws and thick enamel; probably largely plant-eating | “Now THAT is a giant ape! Imagine meeting one in the forest!” |
| Hominidae — Gorilla gorilla | Gorilla = gorilla; gorilla repeated as species name | ~1.4–1.8 m standing; ~1.7–1.8 m body length; ~70–200 kg | Mammalia → Primates → Hominidae | Pleistocene–present | Central Africa | Powerful quadrupedal ape; herbivorous; massive jaws and arms | “Gorillas are powerful, intelligent apes—and mostly peaceful plant-eaters.” |
| Andrewsarchidae — Andrewsarchus mongoliensis | “Andrews' ruler”; mongoliensis = from Mongolia | ~1.5–2 m shoulder height; ~3.5–4.5 m long; ~500–1,000+ kg estimates | Mammalia → Laurasiatheria → Artiodactyla-related group | Eocene, ~45 Ma | Mongolia; Inner Mongolia, China | Known mainly from a gigantic skull; huge teeth; exact lifestyle remains debated | “A gigantic skull, giant teeth, and a mysterious body—Andrewsarchus is one of prehistory's great mammal mysteries!” |
| Ursidae — Ursus arctos | Ursus = bear; arctos = bear | ~0.9–1.5 m shoulder height; ~1.4–2.8 m long; ~80–600+ kg | Mammalia → Carnivora → Caniformia → Ursidae | Pleistocene–present | Eurasia & North America | Brown bear; powerful omnivore; strong claws and jaws | “Brown bears are enormous omnivores. Give one plenty of space!” |
| Elephantidae — Loxodonta africana | “Oblique-sided tooth”; africana = African | ~2.4–4.0 m shoulder height; ~3–7.5 m body length; ~2,000–10,000+ kg | Mammalia → Proboscidea → Elephantidae | Pleistocene–present | Sub-Saharan Africa | African bush elephant; large ears, trunk, tusks; herbivorous | “The African elephant is a true giant—and that trunk is an incredible all-purpose tool!” |
| Elephantidae — Mammuthus primigenius | Mammuthus = mammoth; primigenius = first-born / original | ~2.7–3.4 m shoulder height; ~2.8–4.0 m long; ~4,000–8,000 kg | Mammalia → Proboscidea → Elephantidae | Pleistocene, ~0.8–0.004 Ma | Eurasia & North America; Siberian permafrost deposits | Woolly mammoth; dense fur, fat, small ears and curved tusks adapted to cold | “A furry elephant from the Ice Age! Its thick coat helped it survive some of Earth's coldest environments.” |
| Arsinoitheriidae — Arsinoitherium zitteli | Named after Arsinoë; zitteli honors Karl Alfred von Zittel | ~1.5–1.8 m shoulder height; ~3 m long; ~1.5–2.5 t | Mammalia → Afrotheria → Embrithopoda | Oligocene, ~36–30 Ma | Egypt; Fayum deposits | Large rhino-like herbivore with two enormous pairs of horns; column-like limbs | “Those horns make this strange herbivore look like something from a fantasy world!” |
| Brontotheriidae — Megacerops kuwagatarhinus | “Large horned face”; kuwagatarhinus refers to its distinctive horned snout | ~2.4 m shoulder height; ~4.5–5 m long; ~2–3 t | Mammalia → Perissodactyla → Brontotheriidae | Late Eocene, ~38–34 Ma | North America; western U.S. | Huge rhinoceros-like brontothere; paired nasal horns; browser | “Megacerops was a giant browser with a spectacular horned face. What a prehistoric heavyweight!” |
| Rhinocerotidae — Ceratotherium simum | “White beast”; simum = flat-nosed | ~1.5–1.9 m shoulder height; ~3.7–4 m long; ~1,800–3,500 kg | Mammalia → Perissodactyla → Rhinocerotidae | Pleistocene–present | Africa | White rhinoceros; broad muzzle specialized for grazing; two horns | “Despite its name, the white rhino isn't really white—its name comes from a mistranslation of its broad mouth!” |
| Entelodontidae — Dinohyus hollandi | “Terrible pig”; hollandi honors William J. Holland | ~1.5–1.8 m shoulder height; ~3–3.5 m long; ~500–800+ kg | Mammalia → Artiodactyla → Entelodontidae | Oligocene–Miocene | North America; western U.S. | Giant entelodont with huge jaws and tusk-like teeth; omnivorous/opportunistic | “It looked like a gigantic pig—but entelodonts weren't true pigs!” |
| Paraceratheriidae — Paraceratherium transouralicum | “Near-horned beast”; transouralicum = across the Ural region | ~5–5.5 m shoulder height; ~7–8 m body length; ~10–20+ t | Mammalia → Perissodactyla → Rhinocerotoidea | Oligocene, ~34–23 Ma | Central Asia; Kazakhstan, Mongolia, China | Giant hornless rhinocerotoid; long neck and limbs; among largest terrestrial mammals | “This was one of the largest land mammals ever! No horn was needed to make it impressive.” |
| Giraffidae — Giraffa camelopardalis | “Camel-leopard”; camelopardalis = camel-leopard | ~4.5–5.5 m tall; ~3–4 m body length; ~800–1,900 kg | Mammalia → Artiodactyla → Ruminantia → Giraffidae | Pleistocene–present | Africa | Extremely long neck and legs; browsing herbivore; ossicones | “Giraffes can reach leaves that most other herbivores simply cannot!” |
| Camelidae — Alticamelus altus | “Tall camel”; altus = tall | ~2.5–3 m shoulder height; ~3–4 m long; several hundred kg | Mammalia → Artiodactyla → Tylopoda → Camelidae | Miocene | North America; Great Plains / western deposits | Tall, long-necked camelid; adapted for browsing | “A tall ancient camel from North America! Camel relatives once lived across much more of the world.” |
| Cervidae — Alces americanus | Alces = elk/moose; americanus = American | ~1.4–2.1 m shoulder height; ~2.4–3.2 m long; ~200–700 kg | Mammalia → Artiodactyla → Ruminantia → Cervidae | Pleistocene–present | North America | Moose; huge palmate antlers in males; long legs and specialized muzzle | “The moose is the largest living member of the deer family—and those antlers are enormous!” |
| Megatheriidae — Megatherium altiplanicum | “Great beast”; altiplanicum = of the high plains | ~2.5–3 m high on all fours; ~5–6 m long; ~2–4 t | Mammalia → Xenarthra → Pilosa → Megatheriidae | Pleistocene | South America; Andean/high-altitude deposits | Giant ground sloth; massive claws; herbivorous; could rear onto hind limbs | “A giant sloth several meters long! It was nothing like the small tree sloths alive today.” |
| Glyptodontidae — Doedicurus clavicaudatus | “Pestle-tailed”; clavicaudatus = club-tailed | ~1.3–1.5 m high; ~3.5–4 m long; ~1–1.5 t | Mammalia → Xenarthra → Cingulata → Glyptodontidae | Pleistocene, until ~11 ka | South America | Armored glyptodont; massive domed shell and heavy club-like tail | “An armored mammal with a club tail! Doedicurus looked like a living prehistoric tank.” |
| Macropodidae — Macropus giganteus | “Giant long-foot”; giganteus = gigantic | ~1.0–1.6 m standing; ~1.5–2.5 m total length; ~50–90 kg | Mammalia → Diprotodontia → Macropodiformes → Macropodidae | Pleistocene–present | Australia | Eastern grey kangaroo; powerful hind legs and tail; grazing/browsing herbivore | “Kangaroos turn their powerful hind legs into incredible jumping machines!” |
| Macropodidae — Macropus ferragus | Macropus = long-foot; ferragus = iron-like / iron-colored | ~1–1.5 m estimated; ~2 m total length; tens of kg | Mammalia → Diprotodontia → Macropodiformes → Macropodidae | Pleistocene | Australia | Fossil macropod; proportions and ecology reconstructed from fragmentary remains | “Another ancient kangaroo relative! Fossil macropods show just how diverse Australia's hopping mammals once were.” |
| Castoridae — Castoroides ohioensis | “Beaver-like”; ohioensis = from Ohio | ~1 m shoulder height; ~1.9–2.2 m long; ~60–100+ kg | Mammalia → Rodentia → Castoridae | Pleistocene | North America; wetlands and lake deposits | Giant beaver; aquatic lifestyle; large incisors; probably did not build modern-style dams | “A beaver almost as long as a person is tall! Imagine spotting this giant in an Ice Age lake.” |
| Family / Genus & Species | Name Meaning / Etymology | Height / Length / Mass | Clade / Suborder | Temporal Range | Location & Formations | Diet | Key Anatomical & Ecological Notes | Author | 🧙♀️ Teodora’s Comments |
|---|---|---|---|---|---|---|---|---|---|
| Dinornithidae — Dinornis maximus | “Terrible bird”; maximus = greatest | ~1.8–3.0 m tall; ~2.5–3 m body length; ~120–250 kg | Aves → Palaeognathae → Dinornithiformes | Pleistocene–Holocene, until ~1440 CE | New Zealand; North & South Islands | Herbivore | Giant flightless moa; long legs, small head, no functional wings | Owen, 1843 | “A giant bird that couldn't fly! New Zealand's moa were among the most remarkable birds ever to live.” |
| Phorusrhacidae — Phorusrhacos longissimus | “Rag-bearer”; longissimus = very long | ~2.4–2.7 m tall; ~3 m long; ~130–160 kg | Aves → Cariamiformes → Phorusrhacidae | Miocene, ~15–11 Ma | Argentina; Santa Cruz Formation | Carnivore | Giant terror bird with enormous hooked beak and powerful legs | Ameghino, 1887 | “Now THAT is a bird with a terrifying beak! This giant predator couldn't fly, but it could certainly run.” |
| Gallimimidae — Gallimimus bullatus | “Chicken mimic”; bullatus = capsule-shaped / pendant | ~1.8–2 m hip height; ~5–6 m long; ~400–500 kg | Dinosauria → Theropoda → Coelurosauria → Ornithomimosauria | Late Cretaceous, ~70–66 Ma | Mongolia; Nemegt Formation | Omnivore | Long-legged, lightly built ornithomimosaur; toothless beak; adapted for fast running | Osmólska, Roniewicz & Barsbold, 1972 | “Gallimimus looked like an enormous prehistoric running bird! Those long legs were built for speed.” |
| Struthionidae — Struthio camelus | Struthio = ostrich; camelus = camel | ~2.1–2.8 m tall; ~2–2.7 m long; ~90–150 kg | Aves → Palaeognathae → Struthioniformes | Pleistocene–present | Africa | Omnivore/herbivore | Largest living bird; flightless; extremely powerful legs and two-toed feet | Linnaeus, 1758 | “The ostrich is the largest living bird—and it can run incredibly fast without ever taking flight!” |
| Allosauridae — Allosaurus (Saurophaganax) europaeus | Allosaurus = “different lizard”; Saurophaganax = “lord of lizard eaters”; europaeus = European | ~3–4 m hip height; ~9–12 m long; ~2–4 t | Dinosauria → Theropoda → Carnosauria → Allosauridae | Late Jurassic, ~155–145 Ma | Portugal; Lourinhã Formation | Carnivore | Large allosauroid; blade-like teeth, powerful jaws and grasping three-fingered hands | Mateus, Witzmann, & colleagues / historical Allosaurus material | “A gigantic Jurassic predator! Whether treated as Allosaurus or Saurophaganax, this animal was built to hunt large prey.” |
| Pythonidae — Python reticulatus | “Reticulated python”; reticulatus = net-like | ~1–6+ m; exceptional individuals may exceed 6 m; ~1–75+ kg | Reptilia → Squamata → Serpentes → Pythonidae | Pleistocene–present | Southeast Asia | Carnivore | One of the world's longest snakes; nonvenomous constrictor; heat-sensitive facial pits | Schneider, 1801 | “A snake longer than many cars! The reticulated python uses constriction rather than venom to subdue its prey.” |
| Jonkeriidae — Jonkeria truculenta | Genus named after Jonker; truculenta = fierce / savage | ~3–3.5 m long; ~400–600 kg estimated | Synapsida → Therapsida → Dinocephalia | Middle Permian, ~272–260 Ma | South Africa; Karoo Basin | Herbivore/omnivore | Large dinocephalian with massive skull and robust body | Broom, 1920s | “Long before dinosaurs, giant synapsids like Jonkeria dominated parts of the Permian landscape!” |
| Tanystropheidae — Tanystropheus longobardicus | “Long vertebra”; longobardicus = Lombardian | ~5–6 m long; neck ~3 m; mass perhaps 50–100 kg | Reptilia → Archosauromorpha → Tanystropheidae | Triassic, ~242–228 Ma | Switzerland, Italy; Besano Formation / Monte San Giorgio | Piscivore/carnivore | Extremely elongated neck with relatively few, enormously elongated cervical vertebrae | Bassani, 1886 | “Look at that neck! Tanystropheus had one of the strangest body plans of the Triassic.” |
| Tyrannosauridae — Tyrannosaurus rex | “Tyrant lizard king” | ~3.5–4.7 m hip height; ~12–13 m long; ~7–9+ t | Dinosauria → Theropoda → Carnosauria → Tyrannosauridae | Late Cretaceous, ~68–66 Ma | Western North America; Hell Creek, Lance, Frenchman & equivalent formations | Carnivore | Massive skull, powerful bite, large hind limbs and reduced two-fingered forelimbs | Osborn, 1905 | “The tyrant lizard king! T. rex had one of the most powerful skulls of any known terrestrial predator.” |
| Spinosauridae — Spinosaurus aegyptiacus | “Egyptian spine lizard” | ~2–3 m hip height; ~14–16+ m long; ~6–8+ t | Dinosauria → Theropoda → Megalosauroidea → Spinosauridae | Late Cretaceous, ~99–93.5 Ma | Egypt, Morocco; Bahariya & Kem Kem beds | Piscivore/carnivore | Long crocodile-like snout, conical teeth, elongated neural spines forming a sail; semi-aquatic adaptations | Stromer, 1915 | “A dinosaur with a sail and a crocodile-like snout! Spinosaurus was extraordinarily specialized for life around water.” |
| Ankylosauridae — Ankylosaurus magniventris | “Fused lizard”; magniventris = great-bellied | ~1.7 m high; ~6–8 m long; ~4–8 t | Dinosauria → Ornithischia → Thyreophora → Ankylosauridae | Late Cretaceous, ~68–66 Ma | Western North America; Hell Creek & equivalent formations | Herbivore | Heavy armor, bony plates and a massive tail club | Brown, 1908 | “A living tank! Ankylosaurus carried armor from head to tail—and that tail club could deliver a powerful blow.” |
| Stegosauridae — Stegosaurus stenops | “Roof lizard”; stenops = narrow-faced | ~3–4 m hip height; ~7–9 m long; ~3–5 t | Dinosauria → Ornithischia → Thyreophora → Stegosauridae | Late Jurassic, ~155–150 Ma | Western North America; Morrison Formation | Herbivore | Two rows of plates and four long tail spikes; small skull relative to body | Marsh, 1887 | “Those giant plates and tail spikes make Stegosaurus instantly recognizable!” |
| Hadrosauridae — Lambeosaurus lambei | “Lambe's lizard”; named for Lawrence Lambe | ~2.5–3 m hip height; ~7–9 m long; ~2–5 t | Dinosauria → Ornithischia → Cerapoda → Ornithopoda → Hadrosauridae | Late Cretaceous, ~76–75 Ma | Alberta, Canada; Dinosaur Park Formation | Herbivore | Hollow cranial crest; sophisticated dental battery for processing plants | Parks, 1923 | “That hollow crest wasn't just decoration—it was connected to the animal's nasal passages!” |
| Ceratopsidae — Triceratops horridus | “Three-horned face”; horridus = rough / formidable | ~2.5–3 m hip height; ~7–9 m long; ~6–10+ t | Dinosauria → Ornithischia → Cerapoda → Marginocephalia → Ceratopsidae | Late Cretaceous, ~68–66 Ma | Western North America; Hell Creek & Lance formations | Herbivore | Three horns, enormous bony frill and powerful parrot-like beak | Marsh, 1889 | “Three horns, a huge frill, and a powerful beak—Triceratops was one of the last great dinosaurs!” |
| Diplodocidae — Apatosaurus ajax | “Deceptive lizard”; ajax named for the Greek hero Ajax | ~4.5 m hip height; ~21–23 m long; ~20–30 t | Dinosauria → Sauropodomorpha → Diplodocoidea → Diplodocidae | Late Jurassic, ~152–151 Ma | Western North America; Morrison Formation | Herbivore | Huge quadrupedal sauropod with long neck and whip-like tail | Marsh, 1877 | “Apatosaurus was a gigantic plant-eater with a spectacularly long tail!” |
| Brachiosauridae — Brachiosaurus altithorax | “Arm lizard”; altithorax = deep chest | ~12–18 m shoulder/neck height; ~18–30 m long; ~30–50+ t | Dinosauria → Sauropodomorpha → Macronaria → Brachiosauridae | Late Jurassic, ~154–150 Ma | Western North America; Morrison Formation | Herbivore | Forelimbs longer than hind limbs; high shoulders and elevated neck | Riggs, 1903 | “Its front legs were longer than its back legs—perfect for reaching high vegetation!” |
| Mamenchisauridae — Mamenchisaurus sinocanadorum | “Mamenchi lizard”; sino-canadorum = China–Canada | ~15–18+ m long; neck potentially ~9–10 m; mass several tonnes | Dinosauria → Sauropodomorpha → Eusauropoda → Mamenchisauridae | Late Jurassic, ~160–145 Ma | China; Xinjiang, Shishugou Formation | Herbivore | Extremely elongated neck; among the longest-necked dinosaurs known | Russell & Zheng, 1993 | “That neck is astonishing! Mamenchisaurids pushed sauropod neck proportions to extraordinary lengths.” |
| Azhdarchidae — Quetzalcoatlus northropi | Named after Quetzalcoatl; northropi honors John Northrop | ~5–6 m shoulder height when standing; wingspan ~10–11+ m; ~200–250 kg estimates | Pterosauria → Pterodactyloidea → Azhdarchidae | Late Cretaceous, ~68–66 Ma | Texas, USA; Javelina Formation / Big Bend region | Carnivore/scavenger | One of the largest known flying animals; enormous wings and long toothless beak | Lawson, 1975 | “A flying giant! Quetzalcoatlus had a wingspan comparable to a small airplane.” |
| Deinosuchidae — Deinosuchus hatcheri | “Terrible crocodile”; hatcheri honors John Bell Hatcher | ~8–10+ m long; ~3–5+ t | Crocodylia → Alligatoroidea → Deinosuchidae | Late Cretaceous, ~82–73 Ma | Western North America; Montana, Texas and New Mexico; coastal formations | Carnivore | Enormous crocodilian with huge crushing jaws; capable of attacking dinosaurs | Holland, 1909 | “A crocodile big enough to challenge dinosaurs! Deinosuchus was one of the greatest aquatic predators of its time.” |
| Meganeuridae — Meganeura monyi | “Great-veined”; monyi honors Charles Monier | Wingspan ~65–70 cm; body ~30–35 cm; mass only tens of grams | Arthropoda → Insecta → Odonatoptera → Meganeuridae | Late Carboniferous, ~305 Ma | France; Commentry Formation | Carnivore | Giant griffinfly resembling a gigantic dragonfly; powerful predatory insect | Brongniart, 1893 | “A dragonfly-like insect with a wingspan of more than half a meter! Carboniferous insects could reach astonishing sizes.” |
| Prionosuchidae — Prionosuchus plummeri | “Saw crocodile”; plummeri honors Plummer | ~5–9 m long, possibly larger | Amphibia → Temnospondyli → Archegosauroidea → Prionosuchidae | Permian, ~270 Ma | Brazil; Pedra do Fogo Formation | Piscivore | Giant aquatic temnospondyl with long narrow snout and numerous teeth | Price, 1948 | “This wasn't a crocodile—it was a giant amphibian! Its long jaws made it a formidable aquatic predator.” |
| Teratornithidae — Argentavis magnificens | “Magnificent silver bird”; magnificens = magnificent | Standing height ~1.5–2 m; body ~1.5 m; wingspan ~6–7 m; ~60–80 kg | Aves → Cathartiformes → Teratornithidae | Miocene, ~6–8 Ma | Argentina; Andalhuala Formation | Carnivore/scavenger | One of the largest flying birds known; enormous broad wings | Campbell & Tonni, 1980 | “Argentavis was an enormous flying bird! With a wingspan around six to seven meters, it was a true sky giant.” |
| Pteranodontidae — Pteranodon sternbergi | “Wing without teeth”; sternbergi honors George F. Sternberg | Standing height ~1.5–2 m; length ~5–6 m; wingspan ~6–7 m; ~20–30 kg estimated | Pterosauria → Pterodactyloidea → Pteranodontidae | Late Cretaceous, ~86–84 Ma | Kansas & central USA; Niobrara Formation | Piscivore | Toothless beak, elongated skull crest, enormous wings; likely ocean-going | Harksen, 1966 | “A toothless flying reptile with a huge crest! Pteranodon soared over the ancient Western Interior Seaway.” |
| Family / Genus & Species | Name Meaning / Etymology | Height / Length / Weight | Clade / Suborder | Temporal Range | Location & Formations | Diet | Key Anatomical & Ecological Notes | Author | 🧙♀️ Teodora's Comments |
|---|---|---|---|---|---|---|---|---|---|
| Elasmosauridae — Elasmosaurus platyurus | “Thin-plate reptile”; platyurus = flat-tailed | ~10–11 m long; ~1–2 t | Sauropsida → Plesiosauria → Plesiosauroidea → Elasmosauridae | Late Cretaceous, Campanian, ~80.6–77 Ma | Kansas, USA; Pierre Shale | Fish, cephalopods | Extremely long neck with numerous cervical vertebrae; four paddle-like limbs | Cope, 1868 | “That neck is incredible! Elasmosaurus was a marine reptile with one of the most spectacular necks in prehistory.” (Wikipedia) |
| Pliosauridae — Kronosaurus queenslandicus | “Lizard of Kronos”; queenslandicus = from Queensland | ~8–10 m; several tonnes | Sauropsida → Plesiosauria → Pliosauroidea | Early Cretaceous, ~120–100 Ma | Queensland, Australia; Toolebuc Formation / Eromanga Sea | Fish, ammonites, marine reptiles | Huge skull, powerful jaws and four hydrofoil-like paddles; largest known pliosaurid according to Australian Museum | Longman, 1924 | “Kronosaurus had a gigantic head and powerful jaws. It was one of the great predators of Australia's ancient inland sea!” (The Australian Museum) |
| Shonisauridae — Shonisaurus popularis | “Shoshone lizard”; popularis = common / widespread | ~13–15 m; ~7–10 t | Sauropsida → Ichthyosauria → Shonisauridae | Late Triassic, ~228–208 Ma | Nevada, USA; Luning Formation | Fish, cephalopods | Giant ichthyosaur with extremely elongated body and large flippers | Camp, 1976 | “A gigantic ichthyosaur! Shonisaurus was shaped like a streamlined marine torpedo.” |
| Regalecidae — Regalecus glesne | Regalecus = little king; glesne honors Cornelius Glesne | ~5–8 m; exceptional specimens ~11 m; ~200+ kg | Actinopterygii → Lampriformes → Regalecidae | Pliocene–present | Worldwide oceans | Small fish, crustaceans, plankton | Giant oarfish; extremely elongated ribbon-like body and red dorsal fin rays | Ascanius, 1772 | “The giant oarfish looks like a sea serpent! Its enormous length comes from an incredibly slender body.” |
| Acipenseridae — Huso huso | Huso = sturgeon; huso traditional name | ~2–5 m; exceptional reports >6 m; up to ~1,000+ kg | Actinopterygii → Acipenseriformes → Acipenseridae | Pleistocene–present | Caspian, Black and Azov seas and rivers | Fish, mollusks, crustaceans | Beluga sturgeon; one of the largest bony freshwater/estuarine fishes; produces beluga caviar | Linnaeus, 1758 | “A giant sturgeon! The beluga sturgeon can grow to astonishing proportions and migrate between rivers and seas.” |
| Molidae — Mola mola | Mola = millstone; mola = millstone | ~2–3.3 m long; ~2.3–2.7 t | Actinopterygii → Tetraodontiformes → Molidae | Pleistocene–present | Worldwide temperate and tropical oceans | Jellyfish, zooplankton, soft-bodied prey | Ocean sunfish; huge laterally compressed body; truncated rear fin replaced by clavus | Linnaeus, 1758 | “It looks like a fish that forgot its tail! Mola is actually an enormous and highly specialized ocean fish.” |
| Mobulidae — Manta birostris | Manta = blanket/cloak; birostris = two-beaked | ~5–7 m disc width; ~2–3 t | Chondrichthyes → Elasmobranchii → Myliobatiformes → Mobulidae | Pleistocene–present | Tropical and subtropical oceans | Plankton, small fish | Giant ray with cephalic fins; filter-feeder; highly maneuverable swimmer | Walbaum, 1792 | “A giant flying carpet of the ocean! Manta rays glide through the water while filtering tiny prey.” |
| Xiphiidae — Xiphias gladius | “Sword”; gladius = Roman sword | ~3–4.5 m; ~650 kg maximum reported | Actinopterygii → Istiophoriformes → Xiphiidae | Pleistocene–present | Worldwide warm and temperate oceans | Fish, squid | Swordfish; elongated bill, powerful body and high-speed predatory lifestyle | Linnaeus, 1758 | “The swordfish really does carry a biological sword—but it uses that bill to slash and stun prey!” |
| Pristidae — Pristis pectinata | Pristis = saw; pectinata = comb-like | ~5–6 m; several hundred kg | Chondrichthyes → Elasmobranchii → Rhinopristiformes → Pristidae | Pleistocene–present | Western Atlantic, Caribbean and coastal Americas | Fish, crustaceans | Large sawfish with elongated toothed rostrum used to detect and strike prey | Latham, 1794 | “That isn't a sword—it's a saw! The sawfish's rostrum is packed with specialized sensory organs.” |
| Otodontidae — Otodus megalodon | Otodus = “ear tooth”; megalodon = great tooth | ~15–20 m; estimates up to ~100 t for exceptionally large reconstructions | Chondrichthyes → Elasmobranchii → Lamniformes → Otodontidae | Miocene–Pliocene, ~23–3.6 Ma | Worldwide; marine deposits | Marine mammals, fish, turtles and other large prey | Giant megatooth shark; enormous serrated teeth; apex macropredator | Agassiz, 1835 | “The giant of the shark world! Its enormous teeth reveal a predator capable of tackling very large marine animals.” (DOI) |
| Lamnidae — Carcharodon carcharias | “Sharp tooth”; carcharias = jagged/sharp-toothed | ~4–6.4 m; commonly smaller; several hundred kg | Chondrichthyes → Elasmobranchii → Lamniformes → Lamnidae | Pliocene–present | Worldwide, especially temperate/coastal seas | Fish, rays, seals, sea lions, carrion | Great white shark; serrated triangular teeth and endothermic adaptations | Linnaeus, 1758 | “The great white is an extraordinary modern predator—and unlike the ancient megalodon, it is still swimming in our oceans today.” (FishBase) |
| Rhincodontidae — Rhincodon typus | “Rasp-toothed”; typus = type | ~10–17 m; exceptional females reported ~20 m; up to ~34 t published | Chondrichthyes → Elasmobranchii → Orectolobiformes → Rhincodontidae | Pleistocene–present | Tropical and warm-temperate oceans worldwide | Plankton, krill, small fish | Largest living fish; enormous filter-feeding mouth and distinctive spotted pattern | Smith, 1828 | “The world's largest living fish—and it eats tiny plankton! Size doesn't always mean hunting giant prey.” (FishBase) |
| Cetorhinidae — Cetorhinus maximus | “Sea-dog with maximum size”; maximus = greatest | ~7–12 m commonly; maximum recorded ~15.2 m; up to ~4 t | Chondrichthyes → Elasmobranchii → Lamniformes → Cetorhinidae | Pleistocene–present | Temperate oceans worldwide | Plankton | Basking shark; enormous gill openings and specialized filter-feeding apparatus | Gunnerus, 1765 | “Another giant filter-feeding shark! The basking shark's enormous gill slits help it strain plankton from seawater.” (FishBase) |
| Sphyrnidae — Sphyrna mokarran | Sphyrna = hammer; mokarran = hammerhead | ~4–6 m; ~450 kg+ | Chondrichthyes → Elasmobranchii → Carcharhiniformes → Sphyrnidae | Pleistocene–present | Tropical and warm-temperate oceans | Fish, squid, crustaceans, rays | Great hammerhead; distinctive broad cephalofoil with enhanced sensory field | Rüppell, 1837 | “That hammer-shaped head is one of evolution's strangest designs—and it gives this shark remarkable sensory abilities.” |
| Somniosidae — Somniosus microcephalus | “Sleepy”; microcephalus = small-headed | ~3–5 m; potentially ~7 m; several hundred kg | Chondrichthyes → Elasmobranchii → Squaliformes → Somniosidae | Pleistocene–present | North Atlantic and Arctic waters | Fish, seals, carrion | Greenland shark; extremely slow-growing, cold-water deep-sea predator | Bloch & Schneider, 1801 | “One of the Arctic's mysterious giants! Greenland sharks grow very slowly and live in extremely cold water.” |
| Physeteridae — Physeter macrocephalus | “Blowhole animal”; macrocephalus = large-headed | ~15–18 m; ~35–50+ t | Mammalia → Cetacea → Odontoceti → Physeteridae | Pleistocene–present | Worldwide deep oceans | Squid, fish | Sperm whale; enormous head containing spermaceti organ; deepest-diving toothed whale | Linnaeus, 1758 | “That enormous head belongs to the largest living toothed whale! Sperm whales are famous for their deep-diving squid hunts.” |
| Delphinidae — Orcinus orca | Orcinus = of the kingdom of the dead; orca = large sea creature | ~6–8 m; ~3–6 t | Mammalia → Cetacea → Odontoceti → Delphinidae | Pleistocene–present | Worldwide oceans | Fish, squid, seabirds, marine mammals | Killer whale; highly social toothed whale with sophisticated echolocation and hunting strategies | Linnaeus, 1758 | “Despite the common name, the orca is actually the largest member of the dolphin family!” |
| Balaenopteridae — Balaenoptera musculus musculus | “Muscular whale”; musculus = little mouse/muscle pun | ~24–32 m; ~100–150+ t | Mammalia → Cetacea → Mysticeti → Balaenopteridae | Pleistocene–present | North Atlantic and North Pacific, depending on population | Krill and small schooling prey | Blue whale subspecies; enormous baleen plates and filter-feeding system | Linnaeus, 1758 | “The blue whale is the largest animal known to have lived—and it survives by filtering tiny prey!” |
| Phocidae — Mirounga angustirostris | Mirounga from an Australian Aboriginal name; angustirostris = narrow snout | ~2.5–4 m; ~400–2,300 kg | Mammalia → Carnivora → Pinnipedia → Phocidae | Pleistocene–present | Eastern Pacific; California and Baja California | Fish, squid | Northern elephant seal; males possess enormous inflatable proboscis and are much larger than females | Gill, 1866 | “The males are enormous! Their inflatable noses give elephant seals their unforgettable appearance.” |
| Balaenidae — Balaena mysticetus | Balaena = whale; mysticetus = baleen whale | ~14–18 m; ~60–100 t | Mammalia → Cetacea → Mysticeti → Balaenidae | Pleistocene–present | Arctic and sub-Arctic seas | Zooplankton, copepods, krill | Bowhead whale; enormous baleen rack, thick blubber and massive skull adapted for breaking ice | Linnaeus, 1758 | “The bowhead is built for the Arctic! Its enormous skull can help it break through sea ice.” |
| Basilosauridae — Basilosaurus cetoides | “King lizard”; cetoides = whale-like | ~15–18 m; ~6–10 t | Mammalia → Cetacea → Archaeoceti → Basilosauridae | Late Eocene, ~41–34 Ma | Southeastern USA; Gulf Coast Eocene formations | Fish, sharks, marine mammals | Long, serpentine archaeocete whale with powerful teeth and tiny hind limbs | Owen, 1839 | “Its name means ‘king lizard,’ but Basilosaurus was actually a whale! Its original discoverers simply didn't know that yet.” (PubMed Central (PMC)) |
| Mosasauridae — Tylosaurus iembeensis | “Knob lizard”; iembeensis = from Iembe | ~10–12 m; several tonnes | Sauropsida → Squamata → Mosasauroidea → Mosasauridae | Late Cretaceous | Angola / southern Atlantic African deposits | Fish, turtles, ammonites, marine reptiles | Large mosasaur with elongated body, powerful jaws and a distinctive toothless rostral tip | Antunes, 1964 | “A giant marine lizard! Tylosaurus relatives were among the dominant predators of Late Cretaceous seas.” |
| Hydrodamalidae — Rhytina stelleri | Rhytina = wrinkled; stelleri honors Georg Wilhelm Steller | ~7–9 m; ~4–10 t | Mammalia → Sirenia → Hydrodamalidae | Pleistocene–1768 CE | Bering Sea; Commander Islands | Herbivore | Steller's sea cow; enormous sirenian with thick skin and no functional teeth | Zimmermann, 1780 | “A giant relative of today's manatees! Sadly, Steller's sea cow disappeared only decades after Europeans first scientifically described it.” |
| Pterygotidae — Pterygotus buffalohensis | “Winged one”; buffalohensis = from Buffalo | ~1.5–2 m estimated; mass uncertain | Arthropoda → Chelicerata → Eurypterida → Pterygotidae | Silurian–Devonian | North America; marine deposits | Carnivore | Giant sea scorpion relative with large chelicerae and swimming appendages | Historical pterygotid literature | “A sea scorpion! Pterygotids were enormous arthropods compared with most modern relatives.” |
| Dunkleosteidae — Dinichthys terrelli | “Terrible fish”; terrelli honors J. Terrell | ~6–8+ m; ~1–3.5 t estimates | Placodermi → Arthrodira → Dunkleosteidae | Late Devonian, ~382–358 Ma | Ohio and other eastern North America deposits; Cleveland Shale | Carnivore | Armored placoderm with huge self-sharpening jaw plates instead of conventional teeth | Newberry, 1873 | “Those jaws were made of armor plates! Dinichthys was one of the terrifying predators of Devonian seas.” |
| Majidae — Macrocheira kaempferi | “Large-handed”; kaempferi honors Engelbert Kaempfer | Leg span up to ~3.7–4 m; body ~40 cm; up to ~20 kg | Arthropoda → Crustacea → Decapoda → Brachyura → Majidae | Pleistocene–present | Pacific waters around Japan | Omnivore/scavenger | Japanese spider crab; longest-legged arthropod by leg span among living crustaceans | Temminck, 1836 | “It looks like a giant underwater spider! Its legs can span several meters.” |
| Protostegidae — Archelon ischyros | “Ruler turtle”; ischyros = mighty/strong | ~4–4.6 m long; ~4–5 t | Sauropsida → Testudines → Protostegidae | Late Cretaceous, ~80–74 Ma | Central North America; Western Interior Seaway, Pierre Shale | Jellyfish, ammonites, soft prey | Giant marine turtle with elongated flippers and enormous body | Wieland, 1896 | “The largest known sea turtle! Archelon had enormous flippers for cruising across the Cretaceous ocean.” |
| Architeuthidae — Architeuthis dux | “Ruling giant squid”; dux = leader | ~10–13 m total length; perhaps ~200+ kg | Mollusca → Cephalopoda → Coleoidea → Oegopsida | Pleistocene–present | Deep oceans worldwide | Fish and other cephalopods | Giant squid with huge eyes, eight arms and two extremely long feeding tentacles | Steenstrup, 1857 | “A real deep-sea giant! Its enormous eyes are adaptations for detecting prey and predators in the darkness.” |
| Cyaneidae — Cyanea capillata arctica | Cyanea = blue; capillata = long-haired; arctica = Arctic | Bell commonly up to ~0.5–2 m; tentacles can extend many meters | Cnidaria → Scyphozoa → Semaeostomeae → Cyaneidae | Pleistocene–present | Northern Atlantic and Arctic waters | Zooplankton, fish and other small animals | Lion's mane jellyfish; long trailing tentacles armed with nematocysts | Often treated as an Arctic form/subspecies of C. capillata | “A drifting forest of stinging tentacles! Jellyfish may look delicate, but their nematocysts make them effective predators.” |
