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1 May 2010 Reiszorhinus olsoni, a New Single-Tooth-Rowed Captorhinid Reptile from the Lower Permian of Texas
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A new genus and species of captorhinid reptile from the Lower Permian Waggoner Ranch formation of north-central Texas, Reisz orhinus olsoni, is described on the basis of well-preserved cranial material. The holotypic specimen, consisting of a partial skull and mandible, was misidentifled by S. W. Williston in 1917 as Labidosaurus hamatus. Autapomorphies of the new taxon include recurved teeth and the possession of an extremely large Meckelian foramen on the medial surface of the lower jaw. The new taxon retains the primitive condition of a single row of dentary and maxillary marginal teeth. It is distinguished from other single-tooth-rowed captorhinids, with the exception of Labidosaurus hamatus, by its large size, and it lacks the marked cheek expansion found in other large captorhinids. PAUP and Bayesian analyses suggest the new genus is the most basal of described captorhinid genera with the exceptions of Romeria, Concordia, and Protocaptorhinus. The description of a new, large, single-tooth-rowed form suggests that, in addition to multiple tooth rows, relatively larger size evolved more than once in the basal reptilian family Captorhinidae.

© 2010 by the Society of Vertebrate Paleontology
Stuart S. Sumida, Jeff Dodick, Anthony Metcalf, and Gavan Albright "Reiszorhinus olsoni, a New Single-Tooth-Rowed Captorhinid Reptile from the Lower Permian of Texas," Journal of Vertebrate Paleontology 30(3), 704-714, (1 May 2010).
Received: 13 June 2009; Accepted: 1 August 2009; Published: 1 May 2010

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