A Complete Skeleton of a Late Triassic Saurischian and the Early Evolution of Dinosaurs

Author:

Nesbitt Sterling J.12,Smith Nathan D.34,Irmis Randall B.56,Turner Alan H.7,Downs Alex8,Norell Mark A.1

Affiliation:

1. Division of Paleontology, American Museum of Natural History, New York, NY 10024, USA.

2. Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USA.

3. Committee on Evolutionary Biology, University of Chicago, Chicago, IL 60637, USA.

4. Department of Geology, Field Museum of Natural History, Chicago, IL 60605, USA.

5. Utah Museum of Natural History, 1390 East Presidents Circle, Salt Lake City, UT 84112–0050, USA.

6. Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112–0102, USA.

7. Department of Anatomical Sciences, Stony Brook University, Health Science Center T-8 (040), Stony Brook, NY 11794, USA.

8. Ruth Hall Museum of Paleontology, Ghost Ranch Conference Center, Abiquiu, NM 87510–9601, USA.

Abstract

Early Dinosaur Discovery Our understanding of the evolution of early dinosaurs is hampered by limited material, especially compared to the many Jurassic and Cretaceous samples. Nesbitt et al. (p. 1530 ) provide a complete view of a Late Triassic theropod based on several nearly complete skeletons from New Mexico. The dinosaur elucidates the likely relationships between early theropods and shows that some prominent features were already derived by this time. Comparison among Triassic dinosaur fauna and other early species suggests that Triassic North American fauna were diverse but not endemic, perhaps arising from earlier migrants from South America.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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