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Journal of Vertebrate Paleontology Volume 29, 2009 - Issue 3
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ARTICLES

The occurrence of Contogenys-like lizards in the Late Cretaceous and Early Tertiary of the western interior of the U.S.A.

Randall L. Nydam Arizona College of Osteopathic Medicine, Midwestern University, 19555 N. 59th Avenue, Glendale, Arizona, 85308, U.S.A. E-mail: [email protected]
&
Brandon M. Fitzpatrick Arizona College of Osteopathic Medicine, Midwestern University, 19555 N. 59th Avenue, Glendale, Arizona, 85308, U.S.A.; St. John's College, 1160 Camino Cruz Blanca, Santa Fe, New Mexico, 87505, U.S.A.
Pages 677-701 | Received 02 Apr 2008, Accepted 23 Oct 2008, Published online: 02 Aug 2010
 
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ABSTRACT

Based on diagnostic jaw and dental material from the Cenomanian–middle Paleocene of the western U.S.A., we erect a new fossil lizard taxon, Contogeniidae taxon nov., that contains the following species: Contogenys sloani Estes, 1969 (Maastrichtian–early Paleocene, Montana); Contogenys ekalakaensis sp. nov. (middle Paleocene, Montana); Palaeoscincosaurus middletoni Sullivan and Lucas, 1996 (early Paleocene, Colorado); Palaeoscincosaurus pharkidodon sp. nov. (Campanian, Utah); Utahgenys evansi gen. et sp. nov. (Turonian, Utah); and Utahgenys sp. indet. (Cenomanian, Utah). These taxa share unique characteristics of tooth and jaw morphologies (e.g., tooth crowns truncate and bearing longitudinal apical grooves; hypertrophied inferior alveolar canal). Phylogenetic analysis indicates that among squamates, Contogeniidae taxon nov. is most closely related to Xantusiidae.

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