The Jurassic turtles of North America. Bulletin of the AMNH ; v. 162, article 3

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dc.contributor.author Gaffney, Eugene S. en_US
dc.date.accessioned 2005-10-06T15:09:25Z
dc.date.available 2005-10-06T15:09:25Z
dc.date.issued 1979 en_US
dc.identifier.uri http://hdl.handle.net/2246/1275
dc.description p. 93-135 : ill. ; 26 cm. en_US
dc.description Includes bibliographical references (p. 134-135). en_US
dc.description.abstract "There are two valid turtle taxa from the North American late Jurassic Morrison Formation: Glyptops plicatulus, distinguished by a fine, pustulose shell ornamentation, last vertebral scute partially dividing the last pair of marginal scutes, and a smoothly convex anterior margin of the plastron; and Dinochelys whitei, new genus and species, distinguished by a smooth shell surface, last vertebral scute not dividing the last pair of marginal scutes, and an anterior plastral margin with lobes formed by the gular and intergular scutes. presumed juveniles of Glyptops and Dinochelys suggest that prominent carapacial ridges characterize juveniles of these two taxa and that the ridges are lost in adults. Probaena sculpta Hay is considered a nomen dubium because it is an unidentifiable juvenile, presumably of Glyptops or Dinochelys. Taxa previously referred to Glyptops but here considered indeterminant are: 'Glyptops' pervicax, 'Glyptops' belviderensis, 'Glyptops' caelatus, 'Glyptops' depressus, and 'Glyptops' ruetimeyeri. Dinochelys is placed Cryptodira incertae sedis because the higher systematics of cryptodires is based on skull morphology and the skull is lacking in this form. A cranial study of Glyptops suggests that it and Mesochelys form a monophyletic group, the Glyptopsidae, that is characterized by one derived character: the basisphenoid extends the length of, and completely separates, the pterygoids. I follow Evans and Kemp's (1976) suggestion that the Baenoidea of Gaffney (1972 and 1975) is not monophyletic and that the Glyptopsidae is the sister group of the remaining cryptodires. Baenidae and Eucryptodira would form a monophyletic group sharing the derived character: posterior temporal emargination separating or nearly separating parietal and squamosal"--P. 95. en_US
dc.format.extent 21378394 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York : American Museum of Natural History en_US
dc.relation.ispartofseries Bulletin of the American Museum of Natural History ; v. 162, article 3 en_US
dc.subject.lcc QH1 .A4 vol.162, art.3, 1979 en_US
dc.subject.lcsh Glyptops plicatulus. en_US
dc.subject.lcsh Dinochelys whitei. en_US
dc.subject.lcsh Turtles, Fossil -- West (U.S.) en_US
dc.subject.lcsh Turtles, Fossil -- North America. en_US
dc.subject.lcsh Reptiles, Fossil -- West (U.S.) en_US
dc.subject.lcsh Reptiles, Fossil -- North America. en_US
dc.subject.lcsh Paleontology -- Jurassic -- West (U.S.) en_US
dc.subject.lcsh Paleontology -- Jurassic -- North America. en_US
dc.subject.lcsh Paleontology -- West (U.S.) en_US
dc.subject.lcsh Paleontology -- North America. en_US
dc.subject.lcsh Paleontology -- Morrison Formation. en_US
dc.title The Jurassic turtles of North America. Bulletin of the AMNH ; v. 162, article 3 en_US
dc.type text en_US

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  • Bulletin of the American Museum of Natural History
    The Bulletin, published continuously since 1881, consists of longer monographic volumes in the field of natural sciences relating to zoology, paleontology, and geology. Current numbers are published at irregular intervals. The Bulletin was originally a place to publish short papers, while longer works appeared in the Memoirs. However, in the 1920s, the Memoirs ceased and the Bulletin series began publishing longer papers. A new series, the Novitates , published short papers describing new forms.

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