a new basal sauropodomorph dinosaur from the lower jurassic navajo sandstone of southern utah一个新的基底sauropodomorph低侏罗纪的恐龙犹他州南部的纳瓦霍砂岩.pdfVIP
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a new basal sauropodomorph dinosaur from the lower jurassic navajo sandstone of southern utah一个新的基底sauropodomorph低侏罗纪的恐龙犹他州南部的纳瓦霍砂岩
A New Basal Sauropodomorph Dinosaur from the Lower
Jurassic Navajo Sandstone of Southern Utah
1 2
Joseph J. W. Sertich *, Mark A. Loewen
1 Department of Anatomical Sciences, Stony Brook University, Stony Brook, New York, United States of America, 2 Utah Museum of Natural History, Salt Lake City, Utah,
United States of America
Abstract
Background: Basal sauropodomorphs, or ‘prosauropods,’ are a globally widespread paraphyletic assemblage of terrestrial
herbivorous dinosaurs from the Late Triassic and Early Jurassic. In contrast to several other landmasses, the North American
record of sauropodomorphs during this time interval remains sparse, limited to Early Jurassic occurrences of a single well-
known taxon from eastern North America and several fragmentary specimens from western North America.
Methodology/Principal Findings: On the basis of a partial skeleton, we describe here a new basal sauropodomorph
dinosaur from the Lower Jurassic Navajo Sandstone of southern Utah, Seitaad ruessi gen. et sp. nov. The partially articulated
skeleton of Seitaad was likely buried post-mortem in the base of a collapsed dune foreset. The new taxon is characterized by
a plate-like medial process of the scapula, a prominent proximal expansion of the deltopectoral crest of the humerus, a
strongly inclined distal articular surface of the radius, and a proximally and laterally hypertrophied proximal metacarpal I.
Conclusions/Significance: Phylogenetic analysis recovers Seitaad as a derived basal sauropodomorph closely related to
plateosaurid or massospondylid ‘prosauropods’ and its presence in western North America is not unexpected for a member
of this highly cosmopolitan clade. This occurrence represents one of the most complete vertebrate body fossil specimens
yet recovered fro
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