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The walrus auditory region and the monophyly of pinnipeds. American Museum novitates ; no. 2871

Show simple item record Wyss, André R. en_US 2005-10-06T18:08:48Z 2005-10-06T18:08:48Z 1987 en_US
dc.description 31 p. : ill. ; 26 cm. en_US
dc.description Includes bibliographical references (p. 27-29). en_US
dc.description.abstract "Within the customary tripartite division of pinnipeds a grouping of the Odobenidae (walruses) and Otariidae (sea lions) to the exclusion of the Phocidae (seals) has been almost universally recognized. An anatomical review of features, primarily of the auditory region, however, reveals that odobenids share a significant number of derived characters with phocids. The evidence supporting the traditional otariid/odobenid grouping is examined and is found to consist almost exclusively of primitive, and therefore phylogenetically uninformative, characters. A review of characters that have been proposed as supporting the widely accepted alliance of phocids and mustelids reveals that they fail to provide compelling evidence for pinniped diphyly; the arguments for diphyly are further weakened by acceptance of a phocid-walrus relationship. Some aspects of the cranial morphology of several putative early Miocene otarioids are reviewed, and it is suggested that Pinnarctidion and Allodesmus are actually better regarded as members of a group including phocids and odobenids. Thus, the major morphological gap between the highly derived phocids and their presumed sister group may largely be filled. A cladogram depicting a sister-group relationship between odobenids and phocids, the monophyly of pinnipeds, and the tentative relationships of these fossil taxa is presented"--P. [1]. en_US
dc.format.extent 5961219 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York, N.Y. : American Museum of Natural History en_US
dc.relation.ispartofseries American Museum novitates ; no. 2871 en_US
dc.subject.lcc QL1 .A436 no.2871, 1987 en_US
dc.subject.lcsh Walrus -- Anatomy. en_US
dc.subject.lcsh Walrus en_US
dc.subject.lcsh Odobenidae en_US
dc.subject.lcsh Pinnipedia -- Phylogeny. en_US
dc.subject.lcsh Ear ossicles. en_US
dc.subject.lcsh Ear -- Anatomy. en_US
dc.subject.lcsh Pinnipedia, Fossil. en_US
dc.title The walrus auditory region and the monophyly of pinnipeds. American Museum novitates ; no. 2871 en_US
dc.title.alternative Monophyly of pinnipeds en_US
dc.type text en_US

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  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

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