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

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dc.contributor.authorGaffney, Eugene S.en_US
dc.date.accessioned2005-10-06T15:09:25Z
dc.date.available2005-10-06T15:09:25Z
dc.date.issued1979en_US
dc.descriptionp. 93-135 : ill. ; 26 cm.en_US
dc.descriptionIncludes 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.extent21378394 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/1275
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York : American Museum of Natural Historyen_US
dc.relation.ispartofseriesBulletin of the American Museum of Natural History ; v. 162, article 3en_US
dc.subject.lccQH1 .A4 vol.162, art.3, 1979en_US
dc.subject.lcshGlyptops plicatulus.en_US
dc.subject.lcshDinochelys whitei.en_US
dc.subject.lcshTurtles, Fossil -- West (U.S.)en_US
dc.subject.lcshTurtles, Fossil -- North America.en_US
dc.subject.lcshReptiles, Fossil -- West (U.S.)en_US
dc.subject.lcshReptiles, Fossil -- North America.en_US
dc.subject.lcshPaleontology -- Jurassic -- West (U.S.)en_US
dc.subject.lcshPaleontology -- Jurassic -- North America.en_US
dc.subject.lcshPaleontology -- West (U.S.)en_US
dc.subject.lcshPaleontology -- North America.en_US
dc.subject.lcshPaleontology -- Morrison Formation.en_US
dc.titleThe Jurassic turtles of North America. Bulletin of the AMNH ; v. 162, article 3en_US
dc.typetexten_US

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Bulletin of the American Museum of Natural History