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Permian Gastropoda of the southwestern United States. 3. Bellerophontacea and Patellacea. Bulletin of the AMNH ; v. 119, article 4

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dc.contributor.author Yochelson, Ellis Leon, 1928- en_US
dc.date.accessioned 2005-10-06T14:30:39Z
dc.date.available 2005-10-06T14:30:39Z
dc.date.issued 1960 en_US
dc.identifier.uri http://hdl.handle.net/2246/737
dc.description p. 209-293, [12] p. of plates : ill. ; 27 cm. en_US
dc.description Includes bibliographical references (p. 289-293). en_US
dc.description.abstract "The present study includes two superfamilies of aspidobranch gastropods from the Permian of the southwestern United States. These are the Bellerophontacea, an abundant group having primitive bilateral symmetry, and the Patellacea, a rare group showing superficial, secondary bilateral symmetry. Where possible, species described from Permian outcrops outside North America have been tentatively assigned to the genera studied. Species currently assigned to the Pennsylvanian genera of Bellerophontacea in North America have been briefly reviewed. This is the first published summary of the bellerophontacean species in 60 years. Following Knight's concept, I interpret the Bellerophontacea as being prosobranch gastropods. The slit suggests two gills, and phyletic considerations imply that these gills may have restricted them to a firm bottom in fairly clear water. The Recent Patellacea have a clinging habit, and there is strong suggestive evidence that the Permian species had a similar habit. The Permian Bellerophontacea do not show phyletic size increase through time. The size of Permian species shows no clear trends either in the fauna as a whole or in a few selected species studied in more detail. Size frequency distribution in nine samples suggests that the occasional large specimen encountered is best considered as an extremely old individual. Size frequency studies may be of some use in differentiating between biocoenoses and thanatocoenoses. Nine genera or subgenera of Bellerophontacea are described, one of which is new. Forty-five species of Bellerophontacea are discriminated. Thirty-three of these are considered new, five are redescribed, and seven are discussed but not named. The Patellacea are less varied, with two genera and seven species being recognized. Three species are new, two are redescribed, and two are unnamed. Occurrence data are presented for all species"--P. 211. en_US
dc.format.extent 40454727 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. 119, article 4 en_US
dc.subject.lcc QH1 .A4 vol.119, art.4, 1960 en_US
dc.subject.lcsh Bellerophontacea. en_US
dc.subject.lcsh Patellacea. en_US
dc.subject.lcsh Gastropoda, Fossil -- Texas. en_US
dc.subject.lcsh Gastropoda, Fossil -- Southwest, New. en_US
dc.subject.lcsh Gastropoda, Fossil -- United States. en_US
dc.subject.lcsh Mollusks, Fossil -- Texas. en_US
dc.subject.lcsh Mollusks, Fossil -- Southwest, New. en_US
dc.subject.lcsh Mollusks, Fossil -- United States. en_US
dc.subject.lcsh Paleontology -- Permian -- Texas. en_US
dc.subject.lcsh Paleontology -- Permian -- Southwest, New. en_US
dc.subject.lcsh Paleontology -- Texas. en_US
dc.subject.lcsh Paleontology -- Southwest, New. en_US
dc.subject.lcsh Paleontology -- Pennsylvanian -- United States. en_US
dc.subject.lcsh Paleontology -- United States. en_US
dc.title Permian Gastropoda of the southwestern United States. 3. Bellerophontacea and Patellacea. Bulletin of the AMNH ; v. 119, article 4 en_US
dc.title.alternative Bellerophontacea and Patellacea en_US
dc.title.alternative Pennsylvanian Bellerophontacea 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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