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Cranial morphology of the European Jurassic turtles Portlandemys and Plesiochelys. Bulletin of the AMNH ; v. 157, article 6

Show simple item record Gaffney, Eugene S. en_US 2005-10-06T15:02:14Z 2005-10-06T15:02:14Z 1976 en_US
dc.description p. 489-543 : ill. ; 26 cm. en_US
dc.description Includes bibliographical references (p. 541-543). en_US
dc.description.abstract "A theory of relationships is presented in which the Jurassic turtle genera Portlandemys and Plesiochelys are hypothesized as members of the monophyletic group Chelonioidea based on the possession of the following shared derived characters: 1) dorsum sellae high and separated from sella turcica and foramen anterius canalis carotici interni by prominent bone surface that usually has a sagittal ridge, 2) posterior part of sella turcica not concealed by overhanging dorsum sellae. The relationships of these genera within the Chelonioidea are more difficult to test owing to the fact that at present only the Recent forms are cranially as well known as Portlandemys and Plesiochelys. Nonetheless, I have suggested two contradictory hypotheses, one indicating Plesiochelys and Portlandemys as the sister group of the Dermochelyidae plus Cheloniidae, and the other indicating Plesiochelys as the sister group of the Toxochelyidae, Dermochelyidae, and Cheloniidae. The first hypothesis is consistent with derived characters of the palatine artery, whereas the second is consistent with postcranial derived characters"--p. 491. en_US
dc.format.extent 20096057 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. 157, article 6 en_US
dc.subject.lcc QH1 .A4 vol.157, art.6, 1976 en_US
dc.subject.lcsh Portlandemys. en_US
dc.subject.lcsh Plesiochelys. en_US
dc.subject.lcsh Skull -- Anatomy. en_US
dc.subject.lcsh Turtles, Fossil -- Europe. en_US
dc.subject.lcsh Reptiles, Fossil -- Europe. en_US
dc.subject.lcsh Paleontology -- Jurassic -- Europe. en_US
dc.subject.lcsh Paleontology -- Europe. en_US
dc.title Cranial morphology of the European Jurassic turtles Portlandemys and Plesiochelys. Bulletin of the AMNH ; v. 157, article 6 en_US
dc.title.alternative Jurassic turtles 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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