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A new species of trionychid turtle from the Upper Cretaceous (Campanian) Fruitland Formation of New Mexico, USA

Published online by Cambridge University Press:  25 July 2018

Walter G. Joyce ,
Tyler R. Lyson  and
Joseph J.W. Sertich
Walter G. Joyce
Affiliation:
Departement für Geowissenschaften, Universität Freiburg, Chemin du Musée 6, 1700 Freiburg, Switzerland 〈walter.joyce@unifr.ch〉
Tyler R. Lyson
Affiliation:
Department of Earth Sciences, Denver Museum of Nature & Science, 2001 Colorado Boulevard, Denver, Colorado 80205, USA 〈Tyler.Lyson@dmns.org〉, 〈Joe.Sertich@dmns.org〉
Joseph J.W. Sertich
Affiliation:
Department of Earth Sciences, Denver Museum of Nature & Science, 2001 Colorado Boulevard, Denver, Colorado 80205, USA 〈Tyler.Lyson@dmns.org〉, 〈Joe.Sertich@dmns.org〉
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Abstract

New shell material of a trionychid turtle from the Upper Cretaceous (upper Campanian) Fossil Forest Member of the Fruitland Formation of northwestern New Mexico represents a new species, Gilmoremys gettyspherensis. The material consists of right costals I–III, V, VI, and VIII, left costals V, VII, and VIII, the left half of the entoplastron, the right hypo- and xiphiplastron, and the left hyo-, hypo-, and xiphiplastron. The specimen shows great similarities to the Late Cretaceous (Maastrichtian) trionychid Gilmoremys lancensis (Gilmore, 1916) by having a relatively thin shell, carapacial sculpturing consisting of fine pits combined with extended sinusoidal ridges or grooves, free costal rib ends, presence of a preneural, a distally constricted costal I and distally expanded costal II, two lateral hyoplastral processes, low hyoplastral shoulders, and full midline contact of the elongate xiphiplastra, but differs by being smaller, having raised sinusoidal ridges on the carapace instead of grooves, less distally expanded costals II, and less elongate xiphiplastra. Phylogenetic analysis places Gilmoremys gettyspherensis n. sp. as sister to Gilmoremys lancensis near the base of the clade Plastomenidae. Like the majority of previously described plastomenid materials, the type specimen of Gilmoremys gettyspherensis n. sp. was collected from a mudstone horizon, suggesting a preference for ponded environments.

UUID: http://zoobank.org/e7165061-d86b-46b7-a1f8-c31f5a8ed628

Type
Articles
Information
Journal of Paleontology , Volume 92 , Issue 6 , November 2018 , pp. 1107 - 1114
Copyright
Copyright © 2018, The Paleontological Society 

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