Relationships of the Florentiamyidae (Rodentia, Geomyoidea) based on cranial and dental morphology. American Museum novitates ; no. 2769

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dc.contributor.authorWahlert, John H.en_US
dc.date.accessioned2005-10-06T18:11:54Z
dc.date.available2005-10-06T18:11:54Z
dc.date.issued1983en_US
dc.description23 p. : ill. ; 26 cm.en_US
dc.descriptionIncludes bibliographical references (p. 22-23).en_US
dc.description.abstract"The family Florentiamyidae is redefined based on derived cranial and dental characteristics that demonstrate monophyly. A unique process from the palatine, together with the alisphenoid, forms the edge of the anterior-alar fissure; the foramen for the descending palatine vein is lateral to the process. The optic foramen is larger than 1.0 mm. Masticatory and buccinator foramina are united with the accessory foramen ovale. The temporal foramen is large. The frontal is wide with roughly parallel, marginal flanges that project over the orbits. An anteriorly concave process on the petrosal descends posterior to the fenestra cochleae. The entostyle in the upper molars is elongated and blocks the lingual end of the transverse valley. The florentiamyids share primitive characters with eomyoids and Sciuravus that are modified in other geomyoids; these indicate that the family is the earliest branch in the phylogeny of geomyoid rodents. Cranial and dental morphology of florentiamyids is described. Variations in tooth crown patterns illustrate possible origin of the typical geomyoid pattern. Evidence of cusp height and wear facets supports the hypothesis that geomyoid teeth are widened by the addition of styles. Completeness of fossil material suggests that florentiamyids were burrowers. The genera Sanctimus and Florentiamys are redefined, and three new species of each genus are named and described. New specimens range in age from late Oligocene to early Miocene. Diagnoses of previously described species are revised. The species S. tiptoni is transferred to the genus Florentiamys; ?S. clasoni and ?F. agnewi are designated as Geomyoidea incertae sedis"--P. [1].en_US
dc.format.extent4194006 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/5257
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, N.Y. : American Museum of Natural Historyen_US
dc.relation.ispartofseriesAmerican Museum novitates ; no. 2769en_US
dc.subject.lccQL1 .A436 no.2769, 1983en_US
dc.subject.lcshFlorentiamyidae.en_US
dc.subject.lcshRodents -- Anatomy.en_US
dc.subject.lcshSkull -- Anatomy.en_US
dc.subject.lcshTeeth, Fossil -- West (U.S.)en_US
dc.subject.lcshRodents, Fossil -- West (U.S.)en_US
dc.subject.lcshMammals, Fossil -- West (U.S.)en_US
dc.subject.lcshPaleontology -- Tertiary -- West (u.S.)en_US
dc.subject.lcshPaleontology -- West (u.S.)en_US
dc.titleRelationships of the Florentiamyidae (Rodentia, Geomyoidea) based on cranial and dental morphology. American Museum novitates ; no. 2769en_US
dc.typetexten_US

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