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Small Crocodyliform from the Lower Cretaceous (Late Aptian) of Central Texas and its Systematic Relationship to the Evolution of Eusuchia

Published online by Cambridge University Press:  15 October 2015

Thomas L. Adams
Thomas L. Adams*
Affiliation:
Roy M. Huffington Department of Earth Sciences, Southern Methodist University, Dallas, TX 75275–0395, USA and Witte Museum, San Antonio, TX, 78209, USA,
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Abstract

A new Early Cretaceous neosuchian crocodyliform is recognized on the basis of two skulls and postcranial material collected from the late Aptian Twin Mountains Formation at Proctor Lake, central Texas. The new species, Wannchampsus kirpachi, is distinguished by a unique combination of characters including an enlarged third maxillary tooth, internal choanae bordered anteriorly by the palatines and by the pterygoids posteriorly and laterally, anterior margin of the choanae situated at the posterior edge of the suborbital fenestrae, a median crest along the midline of the parietal and frontal, and procoelous vertebrae. A phylogenetic analysis recovered the new taxon as the sister to the ‘Glen Rose form,’ an undescribed taxon of neosuchian. Together, with Shamosuchus, Batrachomimus, and Rugosuchus, they form a monophyletic group, Paralligatoridae, that is the sister clade to Eusuchia within Neosuchia. The Proctor Lake taxon and the undescribed yet widely discussed ‘Glen Rose form’ are referable to the same genus.

Type
Research Article
Information
Journal of Paleontology , Volume 88 , Issue 5 , September 2014 , pp. 1031 - 1049
Copyright
Copyright © The Paleontological Society 

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