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1 April 2016 A Primitive Hadrosaurid from Southeastern North America and the Origin and Early Evolution of ‘Duck-Billed’ Dinosaurs
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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.

© by the Society of Vertebrate Paleontology
Albert Prieto-Márquez, Gregory M. Erickson, and Jun A. Ebersole "A Primitive Hadrosaurid from Southeastern North America and the Origin and Early Evolution of ‘Duck-Billed’ Dinosaurs," Journal of Vertebrate Paleontology 36(2), (1 April 2016). https://doi.org/10.1080/02724634.2015.1054495
Received: 5 September 2014; Accepted: 1 April 2015; Published: 1 April 2016
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