[Paleontology • 2016]
Eotrachodon orientalis • A Primitive Hadrosaurid from southeastern North America and the Origin and Early Evolution of ‘Duck-billed’ Dinosaurs
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| Eotrachodon orientalis
Prieto-Márquez, Erickson & Ebersole, 2016
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ABSTRACT
Eotrachodon orientalis gen. et sp. nov.
(latest Santonian of Alabama, southeastern U.S.A.) is one of the oldest
and most basal hadrosaurid dinosaurs and the only hadrosaurid from
Appalachia (present day eastern North America) with a preserved skull.
This taxon possesses a relatively derived narial structure that was
until now regarded as synapomorphic for saurolophine (solid-crested or
crestless) hadrosaurids. Maximum parsimony analysis places E. orientalis as
the sister taxon to Saurolophidae (Saurolophinae + Lambeosaurinae).
Character optimization on the phylogeny indicates that the
saurolophine-like circumnarial structure evolved by the Santonian
following the split between saurolophines and lambeosaurines but prior
to the major hadrosaurid radiation. Statistical dispersal-vicariance
analysis posits an Appalachian ancestral area for Hadrosauridae and
subsequent dispersal of their ancestors into Laramidia (present-day
western North America) during the Cenomanian.
Prieto-Márquez, A., G. M. Erickson, and J. A. Ebersole. 2016. A
Primitive Hadrosaurid from southeastern North America and the Origin and
Early Evolution of ‘Duck-billed’ Dinosaurs. Journal of Vertebrate Paleontology. DOI: 10.1080/02724634.2015.1054495
Research team identifies rare dinosaur from Appalachia
http://phy.so/372681843 via @physorg_com
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