Heckert, A B, Fraser, Nicholas C and Schneider, V P (2017) A new species of Coahomasuchus (Archosauria, Aetosauria) from the Upper Triassic Pekin Formation, Deep River Basin, North Carolina. Journal of Paleontology, 91 (1). pp. 162-178. ISSN 1937-2337

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Abstract

We describe a new species of the aetosaur Coahomasuchus, C. chathamensis, based on an incomplete, but largely articulated, anterior portion of a skeleton recovered from a quarry in the Upper Triassic Pekin Formation of Chatham County, North Carolina. This is only the second documented occurrence of Coahomasuchus, with the other being the holotype of C. kahleorum Heckert and Lucas, 1999 from the Upper Triassic Colorado City Formation of Texas. Although much of the specimen is the same size as the holotype of C. kahleorum, the dorsal paramedian osteoderms of the North Carolina taxon are considerably (similar to 1.3x) wider than homologous counterparts in C. kahleorum, and the ventral thoracic osteoderms are also rectangular (similar to 1.5x wider than long), rather than square, presumably to accommodate the wider body. This is a rare instance where two articulated specimens of closely related aetosaur species are available for direct comparison of homologous osteoderms. Isolated osteoderms with similar ornamentation from the same locality indicate that C. chathamensis may have been one of the earliest aetosaurs to attain the broad osteoderm proportions (width: length > 3.5: 1) otherwise known solely from later branching, spinose taxa such as Typothorax. The co-occurrence of Lucasuchus and Coahomasuchus in both North Carolina and Texas supports past correlations indicating an Otischalkian (Carnian) age for these strata and demonstrates that plesiomorphic, non-spinose aetosaur genera were not necessarily endemic to a single basin in North America.

Item Type: Article
Uncontrolled Keywords: CRANIAL ANATOMY; TIME-SCALE; PHYLOGENY; TEXAS; PSEUDOSUCHIA; REPTILIA; STAGONOLEPIDIDAE; TIMESCALE; BRAINCASE; OSTEOLOGY
Subjects: E History America > E11 America (General)
G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QH Natural history
Q Science > QL Zoology
Theme: Understanding the natural world
Department: Natural Sciences
Related URLs:
Depositing User: Ross Anderson
Date Deposited: 27 Feb 2017 15:49
Last Modified: 27 Feb 2017 15:49
URI: http://repository.nms.ac.uk/id/eprint/1803

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