A new chelydroid turtle, <i>Lutemys warreni</i>, gen. et sp. nov., from the Upper Cretaceous (Campanian) Kaiparowits Formation of southern Utah

A fragmentary skeleton from the Kaiparowits Formation (Upper Campanian) of southern Utah represents a new taxon of chelydroid turtle herein named <i>Lutemys warreni</i>. <i>Lutemys warreni</i> differs from other chelydroids in the presence of a smooth shell, lack of plastral or carapacial fontanelles, and development of a thin, gracile plastron. A maximum parsimony analysis of all Late Cretaceous and early Paleogene chelydroids from Laramidia suggests that <i>L. warreni</i> is the most basal known stem kinosternoid. <i>Lutemys warreni</i> therefore represents the fourth named pan-kinosternoid from the Late Cretaceous western island landmass of Laramidia and the first named pan-kinosternoid from the Kaiparowits Formation. The description of <i>L. warreni</i> increases the taxonomic diversity of the Kaiparowits Formation to 16 turtle taxa, making it one of the most diverse fossil turtle assemblages. http://zoobank.org/urn:lsid:zoobank.org:pub:C199E9AE-6F3C-442A-AA12-3960B28F4066 SUPPLEMENTAL DATA—Supplemental materials are available for this article for free at www.tandfonline.com/UJVP Citation for this article: Lyson, T. R., W. G. Joyce, and J. J. W. Sertich. 2017. A new chelydroid turtle, <i>Lutemys warreni</i>, gen. et sp. nov., from the Upper Cretaceous (Campanian) Kaiparowits Formation of southern Utah. Journal of Vertebrate Paleontology. DOI: 10.1080/02724634.2017.1390672.