Editing Trachodon (section)

{{Short description| Dubious extinct genus of dinosaurs}}
{{Use dmy dates|date=December 2022}}
{{speciesbox
| name = ''Trachodon''
| fossil_range = [[Late Cretaceous]], {{fossilrange|77}}
| image= Trachodon mirabilis.jpg
| image_caption = Illustration of the isolated teeth
| genus = Trachodon
| parent_authority = [[Joseph Leidy|Leidy]], 1856
| species = mirabilis
| authority = Leidy, 1856
| synonyms =
*''[[Diclonius]] mirabilis'' <small>(Leidy, 1856)</small>
}}

'''''Trachodon''''' (meaning "rough tooth") is a [[nomen dubium|dubious]] [[genus]] of [[hadrosaurid]] [[dinosaur]] based on [[teeth]] from the [[Campanian]]-age [[Upper Cretaceous]] [[Judith River Formation]] of [[Montana]], U.S.<ref name =JL56>Leidy, J. (1856). "Notice of remains of extinct reptiles and fishes, discovered by F. V. Hayden in the Bad Lands of the Judith River, Nebraska Territories." ''Proceedings of the Academy of Natural Science Philadelphia'', '''8'''(25 March): 72–73.</ref> It is a historically important genus with a convoluted [[Taxonomy (biology)|taxonomy]] that has been all but abandoned by modern dinosaur [[paleontologist]]s.<ref name=BC07>Creisler, B.S. (2007). Deciphering duckbills. in: K. Carpenter (ed.), ''Horns and Beaks: Ceratopsian and Ornithopod Dinosaurs''. Indiana University Press: Bloomington and Indianapolis, 185–210. {{ISBN|0-253-34817-X}}</ref>

Despite being used for decades as the iconic [[Hadrosaurid|duckbill]] dinosaur, the material it is based on is composed of teeth from both duckbills and [[ceratopsid]]s (their teeth have a distinctive double root<ref name=HML07>Hatcher, J.B., Marsh, O.C. and Lull, R.S. (1907). ''The Ceratopsia''. Government Printing Office, Washington, D.C., 300 pp. {{ISBN|0-405-12713-8}}</ref>), and its describer, [[Joseph Leidy]], came to recognize the difference and suggested limiting the genus to what would now be seen as ceratopsid teeth.<ref name=BC07/> Restricted to the duckbill teeth, it may have been a [[Lambeosaurinae|lambeosaurine]].<ref name=CMS36>Sternberg, C.M. (1936). The systematic position of ''Trachodon''. ''Journal of Paleontology'' 10(7):652–655.</ref>