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HandWiki. Hadrosaurid. Encyclopedia. Available online: https://encyclopedia.pub/entry/29337 (accessed on 29 September 2026).
HandWiki. Hadrosaurid. Encyclopedia. Available at: https://encyclopedia.pub/entry/29337. Accessed September 29, 2026.
HandWiki. "Hadrosaurid" Encyclopedia, https://encyclopedia.pub/entry/29337 (accessed September 29, 2026).
HandWiki. (2022, October 14). Hadrosaurid. In Encyclopedia. https://encyclopedia.pub/entry/29337
HandWiki. "Hadrosaurid." Encyclopedia. Web. 14 October, 2022.
Hadrosaurid
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The content is sourced from: https://handwiki.org/wiki/Biology:Hadrosaurid

Hadrosaurids (Greek: ἁδρός, hadrós, "stout, thick"), or duck-billed dinosaurs, are members of the ornithischian family Hadrosauridae. This group is known as the duck-billed dinosaurs for the flat duck-bill appearance of the bones in their snouts. The family, which includes ornithopods such as Edmontosaurus and Parasaurolophus, was a common herbivore in the Upper Cretaceous Period of what is now Asia, Europe, Antarctica, South America, and North America. Hadrosaurids are descendants of the Upper Jurassic/Lower Cretaceous iguanodontian dinosaurs and had a similar body layout. Like the rest of the ornithischians, these animals had a predentary bone and a pubic bone which was positioned backwards in the pelvis. Hadrosaurids are divided into two principal subfamilies: the lambeosaurines (Lambeosaurinae), which had hollow cranial crests or tubes, and the saurolophines, identified as hadrosaurines in most pre-2010 works (Saurolophinae or Hadrosaurinae), which lacked hollow cranial crests (solid crests were present in some forms). Saurolophines tended to be bulkier than lambeosaurines. Lambeosaurines included the aralosaurins, tsintaosaurins, lambeosaurins and parasaurolophins, while saurolophines included the brachylophosaurins, kritosaurins, saurolophins and edmontosaurins. Hadrosaurids were facultative bipeds, with the young of some species walking mostly on two legs and the adults walking mostly on four. Their jaws were evolved for grinding plants, with multiple rows of teeth replacing each other as the teeth wore down.

brachylophosaurins parasaurolophins saurolophins

References

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  17. This information comes from the aforementioned Alan Boyle source from June 29, 2009. However, this specific information is not included in the body of the article, but rather a response by Boyle to comments in the article. Since the comments were written by Boyle himself, and since they cite information he received specifically from Purnell, they are as legitimate a source of information as the article itself.
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  24. Rothschild, B.M.; Tanke, D.H.; Helbling II, M.; Martin, L.D. (2003). "Epidemiologic study of tumors in dinosaurs". Naturwissenschaften 90 (11): 495–500. doi:10.1007/s00114-003-0473-9. PMID 14610645. http://www.springerlink.com/content/ktqqkxcqdc620keb/. Retrieved 2008-07-25. 
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