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Thagomizer on mounted Stegosaurus tail

A thagomizer (/ˈθæɡəmzər/) is the distinctive arrangement of four to ten spikes on the tails of stegosaurid dinosaurs. These spikes are believed to have been a defensive measure against predators.[1]

The arrangement of spikes originally had no distinct name; the term thagomizer was coined in 1982 by cartoonist Gary Larson in his comic The Far Side, and thereafter became gradually adopted as an informal term within scientific circles, research, and education.


A thagomizer on the tail of a Stegosaurus fossil

There has been debate about whether the spikes were used simply for display, as posited by Gilmore in 1914,[2] or used as a weapon. Robert Bakker noted that it is likely that the stegosaur tail was much more flexible than those of other ornithischian dinosaurs because it lacked ossified tendons, thus lending credence to the idea of the tail as a weapon. He also observed that Stegosaurus could have maneuvered its rear easily by keeping its large hindlimbs stationary and pushing off with its very powerfully muscled but short forelimbs, allowing it to swivel deftly to deal with attack.[3] In 2010, analysis of a digitized model of Kentrosaurus aethiopicus showed that the tail could bring the thagomizer around to the sides of the dinosaur, possibly striking an attacker beside it.[4]

In 2001, a study of tail spikes by McWhinney et al.,[5] showed a high incidence of trauma-related damage. This too supports the theory that the spikes were used in combat. There is also evidence for Stegosaurus defending itself, in the form of an Allosaurus tail vertebra with a partially healed puncture wound that fits a Stegosaurus tail spike.[6] Stegosaurus stenops had four dermal spikes, each about 60–90 cm (2–3 ft) long. Discoveries of articulated stegosaur armor show that, at least in some species, these spikes protruded horizontally from the tail, not vertically as is often depicted. Initially, Marsh described S. armatus as having eight spikes in its tail, unlike S. stenops. However, recent research re-examined this and concluded this species also had four.[7][8]


A thagomizer graph

In a 2017 paper, the term thagomizer graph (and also the associated "thagomizer matroid") has been introduced for the complete tripartite graph K1,1,n.[9]


This Far Side cartoon is the source of the term thagomizer

The term thagomizer was coined by Gary Larson in jest. In a 1982 The Far Side comic, a group of cavemen in a faux-modern lecture hall are taught by their caveman professor that the spikes on a stegosaur's tail are so named "after the late Thag Simmons".[10]

The term was picked up initially by Ken Carpenter, a paleontologist at the Denver Museum of Nature and Science, who used the term when describing a fossil at the Society of Vertebrate Paleontology Annual Meeting in 1993.[11] Thagomizer has since been adopted as an informal anatomical term,[12] and is used by the Smithsonian Institution,[11][13] the Dinosaur National Monument, the book The Complete Dinosaur[14] and the BBC documentary series Planet Dinosaur.[15]

As stegosaurs and humans did not exist in the same era Gary Larson suggests in The Prehistory of the Far Side that "there should be cartoon confessionals where we could go and say things like, 'Father, I have sinned – I have drawn dinosaurs and hominids together in the same cartoon.'"[16]

See also[edit]

Other articles of the topic Dinosaurs : Adratiklit
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  • Strigiphilus garylarsoni
  • Timeline of stegosaur research

Other scientific terms first used in fiction:

  • Boojum tree
  • Flange as the collective noun for baboons
  • Horrendous Space Kablooie
  • Quark
  • Shmoo
  • Snark
  • Sonic hedgehog
  • Steve
  • Waldo


  1. Holtz, T. R., (2000) "Classification and Evolution of the Dinosaur Groups" (pp. 140–168) in The Scientific American Book of Dinosaurs, edited by Gregory S. Paul, New York: St Martin's Press ISBN 0-312-26226-4 Search this book on Amazon.com Logo.png..
  2. Gilmore, C. W. (1914). "Osteology of the armored Dinosauria in the United States National Museum, with special reference to the genus Stegosaurus". Series: Smithsonian Institution. United States National Museum. Bulletin 89. Government Printing Office, Washington (89).
  3. Bakker, R. T. (1986). The Dinosaur Heresies. New York: William Morrow. Search this book on Amazon.com Logo.png[ISBN missing][page needed]
  4. Naish, Darren (2010). "Heinrich's digital Kentrosaurus: the SJG stegosaur special, part II". Tetrapod Zoology. Archived from the original on January 9, 2011. Retrieved January 19, 2011. Unknown parameter |url-status= ignored (help)
  5. McWhinney, L. A.; Rothschild, B. M. & Carpenter, K. (2001). "Posttraumatic Chronic Osteomyelitis in Stegosaurus dermal spikes". In Carpenter, Kenneth. The Armored Dinosaurs. Indiana University Press. pp. 141–56. ISBN 978-0-253-33964-5.CS1 maint: Multiple names: authors list (link) Search this book on Amazon.com Logo.png
  6. Carpenter, Kenneth; Sanders, Frank; McWhinney, Lorrie A.; Wood, Lowell (2005). "Evidence for predator-prey relationships: Examples for Allosaurus and Stegosaurus". In Carpenter, Kenneth. The Carnivorous Dinosaurs. Bloomington and Indianapolis: Indiana University Press. p. 325. ISBN 978-0-253-34539-4. Unknown parameter |name-list-style= ignored (help) Search this book on Amazon.com Logo.png
  7. Marsh, O. C (1877). "A new order of extinct Reptilia (Stegosauria) from the Jurassic of the Rocky Mountains". American Journal of Science. 14 (84): 513–14. Bibcode:1877AmJS...14..513M. doi:10.2475/ajs.s3-14.84.513. Unknown parameter |s2cid= ignored (help)
  8. Carpenter, K. & Galton, P. M. (2001). "Othniel Charles Marsh and the Eight-Spiked Stegosaurus". In Carpenter, Kenneth. The Armored Dinosaurs. Indiana University Press. pp. 76–102. ISBN 978-0-253-33964-5.CS1 maint: Multiple names: authors list (link) Search this book on Amazon.com Logo.png
  9. Gedeon, Katie; Proudfoot, Nicholas; Young, Benjamin (2017). "Kazhdan-Lusztig polynomials of matroids: a survey of results and conjectures" (PDF). Séminaire Lotharingien de Combinatoire. 78B: 80. arXiv:1611.07474.
  10. Black, Riley (March 30, 2011). "Watch Out For That Thagomizer!". Smithsonian.com. Retrieved May 28, 2019.
  11. 11.0 11.1 "The word: Thagomizer". New Scientist. July 8, 2006. Archived from the original on September 30, 2007.
  12. Holtz, Thomas, R. Jr. (2007). Dinosaurs: the Most Complete, Up-To-Date Encyclopedia for Dinosaur Lovers of All Ages. New York: Random House. p. 230. ISBN 978-0-375-82419-7. Search this book on Amazon.com Logo.png
  13. "Stegosaurus Changes". Smithsonian National Museum of Natural History, Department of Paleobiology. Archived from the original on December 14, 2004. Retrieved March 3, 2007. Unknown parameter |url-status= ignored (help)
  14. Galton, Peter M. (1999). "Stegosaurs". In Farlow, James Orville; Brett-Surman, M. K. The Complete Dinosaur. Indiana University Press. p. 302. ISBN 978-0253213136. Retrieved December 11, 2016. In all stegosaurs, the terminal tail spines (thagomizer) presumably played a role in defense.
  15. "Fight For Life". Planet Dinosaur. Season 1. Episode 4. November 26, 2015. Event occurs at 9 minutes 14 seconds. BBC. BBC One. Retrieved December 11, 2016. Stegosaurus: a heavily armored tank with a deadly weapon at the end of its tail, known as a thagomizer.
  16. Larson, G. (1992) The Prehistory of the Far Side p. 137. Warner Books.

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