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Cranial Osteology of Hypsognathus fenneri, a Latest Triassic Procolophonid Reptile from the Newark Supergroup of Eastern North America

Hans-Dieter Sues, Paul E. Olsen, Diane M. Scott and Patrick S. Spencer
Journal of Vertebrate Paleontology
Vol. 20, No. 2 (Jun. 27, 2000), pp. 275-284
Stable URL: http://www.jstor.org/stable/4524093
Page Count: 10
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Cranial Osteology of Hypsognathus fenneri, a Latest Triassic Procolophonid Reptile from the Newark Supergroup of Eastern North America
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Abstract

Based primarily on two previously undescribed skulls, this paper presents a detailed description of the skull and mandible of the latest Triassic procolophonid reptile Hypsognathus fenneri Gilmore, 1928. One of the new skulls, belonging to a presumed juvenile, clearly establishes for the first time the sutural pattern, which differs significantly from that in Procolophon and more basal procolophonid taxa. A number of shared derived features in the structure of the skull and mandible indicate that Hypsognathus is closely related to Leptopleuron from the Upper Triassic Lossiemouth Sandstone Formation of Scotland. Hypsognathus had a wide geographic and stratigraphic distribution in eastern North America during the latest Triassic (Norian-Rhaetian).

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