|Named By:||Albert PrietoinMarquez, Gregory M. Erickson& Jun A. Ebersole in 2016|
|Time Period:||Late Cretaceous, 86-83.6 Ma|
|Location:||USA, Alabama - Mooreville Chalk Formation|
|Size:||Holotype skull reconstructed to be about 42 centimetres long. Total body length estimated at between six and nine meters long, but this is highly speculative|
|Fossil(s):||Almost complete skull, lower jaws, some vertebrae and fragmentary limb bones|
|Classification:||| Chordata | Reptilia | Dinosauria | Ornithischia | Ornithopoda | Hadrosauridae ||
Eotrachodon orientalis 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.