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Journal of Vertebrate Paleontology Volume 22, 2002 - Issue 3
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PAPERS

The skull of the pistosaur Augustasaurus from the Middle Triassic of northwestern Nevada

Olivier Rieppela Department of Geology, The Field Museum, 1400 S Lake Shore Drive, Chicago, Illinois, 60605-2496, U.S.A.
,
P. Martin Sanderb Institut für Paläontologie, Universität Bonn, Nussallee 8, D-53115 Bonn, Germany
&
Glenn W. Storrsc Cincinnati Museum of Natural History, Collections and Research, 1720 Gilbert Avenue, Cincinnati, Ohio, 45202, U.S.A.
Pages 577-592 | Received 04 Mar 2001, Accepted 10 Nov 2001, Published online: 24 Aug 2010
 
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ABSTRACT

The skull of Augustasaurus hagdorni from the Middle Triassic of northwestern Nevada is described in detail, and compared to those of Pistosaurus and Plesiosaurus. New information amends the earlier description of the postcranial skeleton of Augustasaurus. Phylogenetic analysis corroborates the sister-group relationship of Augustasaurus and Pistosaurus. These two taxa form a clade that is the sister-group of Plesiosaurus. The paleobiogeographical implication of the sister-group relationship of Augustasaurus and Pistosaurus is discussed and linked to the exotic terrane model.

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