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

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dc.contributor.authorWyss, André R.en_US
dc.date.accessioned2005-10-06T18:08:48Z
dc.date.available2005-10-06T18:08:48Z
dc.date.issued1987en_US
dc.description31 p. : ill. ; 26 cm.en_US
dc.descriptionIncludes 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.extent5961219 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/5195
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, N.Y. : American Museum of Natural Historyen_US
dc.relation.ispartofseriesAmerican Museum novitates ; no. 2871en_US
dc.subject.lccQL1 .A436 no.2871, 1987en_US
dc.subject.lcshWalrus -- Anatomy.en_US
dc.subject.lcshWalrusen_US
dc.subject.lcshOdobenidaeen_US
dc.subject.lcshPinnipedia -- Phylogeny.en_US
dc.subject.lcshEar ossicles.en_US
dc.subject.lcshEar -- Anatomy.en_US
dc.subject.lcshPinnipedia, Fossil.en_US
dc.titleThe walrus auditory region and the monophyly of pinnipeds. American Museum novitates ; no. 2871en_US
dc.title.alternativeMonophyly of pinnipedsen_US
dc.typetexten_US

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