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Eotrachodon Temporal range: Late Cretaceous, 86–83.6 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Right premaxilla
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	†Ornithischia
Clade:	†Neornithischia
Clade:	†Ornithopoda
Family:	†Hadrosauridae
Genus:	†Eotrachodon Prieto-Márquez, Erickson and Ebersole, 2016
Type species
†Eotrachodon orientalis Prieto-Marquez, Erickson and Ebersole, 2016

Eotrachodon orientalis (meaning "dawn Trachodon from the east") is a species of hadrosaurid that was described in 2016. The holotype was found in the Mooreville Chalk Formation (Upper Santonian) in Alabama in 2007 and includes a well-preserved skull and partial skeleton, making it a rare find among dinosaurs of Appalachia. Another primitive hadrosaur, Lophorhothon, is also known from the same formation, although Eotrachodon lived a few million years prior. A phylogenetic study has found Eotrachodon to be the sister taxon to the hadrosaurid subfamilies Lambeosaurinae and Saurolophinae. This, along with the other Appalachian hadrosaur Hadrosaurus and possibly Lophorhothon, Claosaurus and both species of Hypsibema, suggests that Appalachia was the ancestral area of Hadrosauridae.

See also

• Timeline of hadrosaur research
• 2016 in paleontology

References

1. ^ Prieto-Marquez, Albert; Erickson, Gregory M.; Ebersole, Jun A. (2016). "A primitive hadrosaurid from southeastern North America and the origin and early evolution of 'duck-billed' dinosaurs". Journal of Vertebrate Paleontology. 36 (2): e1054495. Bibcode:2016JVPal..36E4495P. doi:10.1080/02724634.2015.1054495. S2CID 86032549.

Further reading

• Prieto-Márquez, Albert; Erickson, Gregory M.; Ebersole, Jun A. (14 April 2016). "Anatomy and osteohistology of the basal hadrosaurid dinosaur Eotrachodon from the uppermost Santonian (Cretaceous) of southern Appalachia". PeerJ. 4: e1872. doi:10.7717/peerj.1872. PMC 4841272. PMID 27114863.

v t e Ornithopoda
Kingdom: Animalia Phylum: Chordata Clade: Dinosauria Clade: Ornithischia Clade: Neornithischia Clade: Cerapoda Avemetatarsalia see Avemetatarsalia Ornithischia see Ornithischia Ornithopoda see below↓
Ornithopoda Ornithopoda Burianosaurus Callovosaurus Thescelosauridae? Hypsilophodontidae? Gideonmantellia? Hypsilophodon Vectidromeus? Elasmaria Anabisetia Atlascopcosaurus Chakisaurus Diluvicursor Fostoria? Galleonosaurus Gasparinisaura Isasicursor Kangnasaurus? Leaellynasaura Macrogryphosaurus Mahuidacursor Morrosaurus Muttaburrasaurus? Notohypsilophodon Qantassaurus Sektensaurus Talenkauen Tietasaura Trinisaura Weewarrasaurus? Rhabdodontomorpha Ampelognathus? Emiliasaura Fostoria? Muttaburrasaurus? Tenontosauridae? Convolosaurus? Iani Tenontosaurus Rhabdodontidae Matheronodon Mochlodon Pareisactus Rhabdodon Transylvanosaurus Zalmoxes Dryomorpha Draconyx Hesperonyx Owenodon Dryosauridae Dryosaurus Dysalotosaurus Elrhazosaurus Eousdryosaurus Iyuku? Kangnasaurus? Valdosaurus Ankylopollexia Barilium Bayannurosaurus Calvarius Camptosaurus Cedrorestes Cumnoria? Dakotadon Fukuisaurus Hippodraco Iguanacolossus Lanzhousaurus Lurdusaurus Magnamanus Napaisaurus Oblitosaurus Osmakasaurus Planicoxa Proa Ratchasimasaurus Riabininohadros Theiophytalia Uteodon Hadrosauriformes Bolong Brighstoneus Hypselospinus Jinzhousaurus Mantellisaurus Morelladon Ouranosaurus Iguanodontidae Barilium? Comptonatus Iguanodon Mantellisaurus? Hadrosauroidea see below↓
Hadrosauroidea Hadrosauroidea Altirhinus Bactrosaurus Batyrosaurus? Choyrodon Claosaurus Datonglong Eolambia Equijubus Fylax Gilmoreosaurus Gobihadros Gongpoquansaurus Gonkoken Huehuecanauhtlus Jeyawati Jintasaurus Koshisaurus? Levnesovia Lophorhothon Nanningosaurus Nanyangosaurus Penelopognathus Plesiohadros Portellsaurus Probactrosaurus Protohadros Qianjiangsaurus Shuangmiaosaurus Siamodon Sirindhorna Tanius Telmatosaurus Tethyshadros Xuwulong Yunganglong Zhanghenglong Zuoyunlong Hadrosauridae Aquilarhinus Eotrachodon Hadrosaurus Lapampasaurus Malefica Yamatosaurus Lambeosaurinae Adynomosaurus Ajnabia Angulomastacator Aralosaurus Arenysaurus Blasisaurus Canardia Jaxartosaurus Kazaklambia Latirhinus? Minqaria Nipponosaurus Pararhabdodon Tsintaosaurus Parasaurolophini Adelolophus Charonosaurus Parasaurolophus Tlatolophus Lambeosaurini Amurosaurus Corythosaurus Hypacrosaurus Lambeosaurus Magnapaulia Olorotitan Sahaliyania Velafrons Saurolophinae Barsboldia Brachylophosaurini Acristavus Brachylophosaurus Maiasaura Ornatops Probrachylophosaurus Wulagasaurus? Austrokritosauria Bonapartesaurus Huallasaurus Kelumapusaura Secernosaurus Kritosaurini Anasazisaurus? Coahuilasaurus Gryposaurus Kritosaurus Naashoibitosaurus Rhinorex Saurolophini Augustynolophus Prosaurolophus Saurolophus Edmontosaurini Edmontosaurus Kamuysaurus Kerberosaurus Kundurosaurus Laiyangosaurus Shantungosaurus
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• Late Cretaceous dinosaurs of North America
• Hadrosaurs
• Fossil taxa described in 2016
• Mooreville Chalk
• Ornithischian genera