Halgaitosaurus gregarius, a New Upper Carboniferous Araeoscelidian (Reptilia: Diapsida) from the Halgaito Formation, Bears Ears National Monument, Utah, USA
A. Henrici, D. Berman, S. Sumida, Adam K. Huttenlocker
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引用次数: 0
Abstract
ABSTRACT Halgaitosaurus gregarius is a new genus and species of araeoscelidian diapsid reptile based on numerous specimens from the Upper Carboniferous (Virgilian, Gzhelian) Birthday bonebed, Halgaito Formation, Valley of the Gods, Bears Ears National Monument, Utah, USA. An ontogenetic series is represented by juvenile to fully ossified adult specimens. halgaitosaurus gregarius is distinguished from other araeoscelidians by relative sizes of maxillary teeth, a small contribution of the jugal to the ventral margin of the skull, and eight cervical vertebrae. A phylogenetic analysis suggests that halgaitosaurus and Araeoscelis Williston, 1910, form a clade in a monophyletic Araeoscelidia, with Petrolacosaurus Lane, 1945, and Zarcasaurus Brinkman, Berman, and Eberth, 1984, forming successive sister taxa to this clade. Spinoaequalis deBraga and Reisz, 1995, places as a member of Neodiapsida. halgaitosaurus was an abundant component of the vertebrate fauna that inhabited the coastal plain on the southwestern border of the Paradox Basin in western Pangea during a relatively short period when intermittent to probable perennial streams and rivers traversed it during an otherwise semi-arid to arid climate.
期刊介绍:
Annals of Carnegie Museum is a quarterly journal that publishes peer-reviewed short and medium-length original scientific contributions in organismal biology, earth sciences, and anthropology, in 40 by 52.5 pica format (168 by 220 mm or 6-5/8 by 8-5/8 inches). Subject matter must be relevant to Carnegie Museum of Natural History scientific sections or Powdermill Nature Reserve (PNR), preferably with connection to the Carnegie collection and/or personnel. Carnegie Museum staff and research associates receive publication priority, but others are encouraged to submit papers, especially those manuscripts explicitly based on the Carnegie collection.