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Wannchampsus, new crocodyliform from Lower Cretaceous of Texas
A new paper:
Thomas L. Adams (2014)
Small crocodyliform from the Lower Cretaceous (late Aptian) of central
Texas and its systematic relationship to the evolution of Eusuchia.
Journal of Paleontology 88(5): 1031-1049
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.