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Geology; October 2004; v. 32; no. 10; p. 877-880; DOI: 10.1130/G20695.1
© 2004 Geological Society of America
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Shape of Mesozoic dinosaur richness

David E. Fastovsky1, Yifan Huang2, Jason Hsu2, Jamie Martin-McNaughton3, Peter M. Sheehan4 and David B. Weishampel5

1 Department of Geosciences, University of Rhode Island, Kingston, Rhode Island 02881, USA
2 Department of Statistics, Ohio State University, Columbus, Ohio 43210, USA
3 Department of Geosciences, University of Rhode Island, Kingston, Rhode Island 02881, USA
4 Department of Geology, Milwaukee Public Museum, Milwaukee, Wisconsin 53233, USA
5 Department of Functional Anatomy and Evolution, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA

The richness of Mesozoic Dinosauria is examined through the use of a new global database. Mesozoic dinosaurs show a steadily increasing rate of diversification, in part attributable to the development of new innovations driving an increasing variety of behavioral strategies. The data do not suggest that dinosaurs were decreasing in richness leading to extinction during the last ~10 m.y. of the Cretaceous. Refinement of the dating of dinosaur fossils, rather than the collection of more dinosaurs, is the best way to resolve globally the rate of the Cretaceous-Tertiary dinosaur extinction.

Key Words: dinosaurs • richness • Mesozoic • diversity • rarefaction




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