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.authorWible, John R.en_US
dc.contributor.authorRougier, Guillermo W.en_US
dc.contributor.authorNovacek, Michael J.en_US
dc.contributor.authorMcKenna, Malcolm C.en_US
dc.contributor.authorMongolian-American Museum Paleontological Project.en_US
dc.contributor.authorMongolyn Shinzhlėkh Ukhaany Akademi.en_US
dc.date.accessioned2005-10-06T16:43:42Z
dc.date.available2005-10-06T16:43:42Z
dc.date.issued2001en_US
dc.description44 p. : ill. ; 26 cm.en_US
dc.descriptionIncludes bibliographical references (p. 31-36).en_US
dc.description.abstractA 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.en_US
dc.format.extent419107 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/2939
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, NY : American Museum of Natural Historyen_US
dc.relation.ispartofseriesAmerican Museum novitates ; no. 3322en_US
dc.subject.lccQL1 .A436 no.3322, 2001en_US
dc.subject.lcshProkennalestes trofimovi.en_US
dc.subject.lcshPetrous bone.en_US
dc.subject.lcshMammals, Fossil -- Mongolia -- Khoobur Region.en_US
dc.subject.lcshPaleontology -- Cretaceous -- Mongolia -- Khoobur Region.en_US
dc.subject.lcshPaleontology -- Mongolia -- Khoobur Region.en_US
dc.titleEarliest eutherian ear region : a petrosal referred to Prokennalestes from the early Cretaceous of Mongolia. American Museum novitates ; no. 3322en_US
dc.title.alternativePetrosal referred to Prokennalestesen_US
dc.typetexten_US

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