Earliest eutherian ear region : a petrosal referred to Prokennalestes from the early Cretaceous of Mongolia. American Museum novitates ; no. 3322

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dc.contributor.author Wible, John R. en_US
dc.contributor.author Rougier, Guillermo W. en_US
dc.contributor.author Novacek, Michael J. en_US
dc.contributor.author McKenna, Malcolm C. en_US
dc.contributor.author Mongolian-American Museum Paleontological Project. en_US
dc.contributor.author Mongolyn Shinzhlėkh Ukhaany Akademi. en_US
dc.date.accessioned 2005-10-06T16:43:42Z
dc.date.available 2005-10-06T16:43:42Z
dc.date.issued 2001 en_US
dc.identifier.uri http://hdl.handle.net/2246/2939
dc.description 44 p. : ill. ; 26 cm. en_US
dc.description Includes bibliographical references (p. 31-36). en_US
dc.description.abstract "A right petrosal from the ?Aptian or Albian Khoobur locality is referred on the basis of size and morphology to Prokennalestes trofimovi, the earliest eutherian previously known only from dentigerous elements. The petrosal shows a mosaic of primitive and derived features, bearing on the purported therian and eutherian morphotypes. Among the primitive features shared with the early Cretaceous prototribosphenidan Vincelestes and other more basal taxa that are modified in later eutherians and metatherians are the pattern of basicranial arterial and venous circulation, including a prootic canal and an intrapetrosal inferior petrosal sinus; a vertical paroccipital process; and a fenestra semilunaris, an incomplete wall between the cavum epiptericum and cavum supracochleare. Among the derived features shared with therians is a cochlea coiled through a minimum of 360, with Prokennalestes extending the range of the oldest occurrence of such a coiled cochlea by at least 10 million years. Shared with late Cretaceous eutherians is a shallow internal acoustic meatus with a thin prefacial commissure. The petrosal referred to Prokennalestes is intermediate in having a reduced anterior lamina and lateral flange, both of which are well developed in Vincelestes and essentially lacking in later eutherians and metatherians. Features previously held to be part of the therian and eutherian morphotypes, such as the absence of the anterior lamina and lateral flange, may have been lost independently in metatherians and in post-Prokennalestes eutherians"--P. [1]. en_US
dc.format.extent 419107 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York, NY : American Museum of Natural History en_US
dc.relation.ispartofseries American Museum novitates ; no. 3322 en_US
dc.subject.lcc QL1 .A436 no.3322, 2001 en_US
dc.subject.lcsh Prokennalestes trofimovi. en_US
dc.subject.lcsh Petrous bone. en_US
dc.subject.lcsh Mammals, Fossil -- Mongolia -- Khoobur Region. en_US
dc.subject.lcsh Paleontology -- Cretaceous -- Mongolia -- Khoobur Region. en_US
dc.subject.lcsh Paleontology -- Mongolia -- Khoobur Region. en_US
dc.title Earliest eutherian ear region : a petrosal referred to Prokennalestes from the early Cretaceous of Mongolia. American Museum novitates ; no. 3322 en_US
dc.title.alternative Petrosal referred to Prokennalestes 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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