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The origin and affinities of the South American Condylarthra and early Tertiary Litopterna (Mammalia). American Museum novitates ; no. 2772

Show simple item record Cifelli, Richard. en_US 2005-10-06T18:11:52Z 2005-10-06T18:11:52Z 1983 en_US
dc.description 49 p. : ill. ; 26 cm. en_US
dc.description Includes bibliographical references (p. 42-49). en_US
dc.description.abstract "A previously unknown genus and species of a primitive litoptern from the late Paleocene (Riochican) of Itaboraí, Brazil, is described, and three previously described didolodontid and litoptern species from Itaboraí are referred to new genera. Comparative analysis of the dentition of didolodontids and primitive Litopterna suggests a number of revisions in their taxonomy. The two Itaboraí didolodonts appear to be more closely related to each other than to Patagonian forms; Protolipterna, new genus, Miguelsoria, new genus, ?and Asmithwoodwardia are placed in the Litopterna in a new family, Protolipternidae. Anisolambda (including Ricardolydekkeria and Josepholeidya) and allies seem to be related to true proterotheriids, and are placed in the Proterotheriidae in a new subfamily, Anisolambdinae, whereas the Polymorphinae (including only the type genus) appears to be related to the Macraucheniidae. Proectocion (including Oxybunotherium), previously referred to the Didolodontidae, is placed in the advanced litoptern family Adianthidae. An ancestral morphotype for the Litopterna and Didolodontidae is constructed on the basis of their known morphology and by comparison with primitive oxyclaenine arctocyonids such as Protungulatum. Relevant North American ungulate families (Arctocyonidae, Hyopsodontidae, Phenacodontidae, Periptychidae) are briefly reviewed and their members compared with this hypothetical ancestor. The primitive litoptern/didolodont morphotype is closely comparable to and shares derived conditions with Torrejonian mioclaenine hyopsodonts such as Litaletes. Such an exclusive relationship implies that the indigenous South American ungulate orders may not represent a strictly monophyletic unit with respect to other Eutheria"--P. [1]. en_US
dc.format.extent 7964893 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. 2772 en_US
dc.subject.lcc QL1 .A436 no.2772, 1983 en_US
dc.subject.lcsh Condylarthra -- South America. en_US
dc.subject.lcsh Litopterna. en_US
dc.subject.lcsh Mammals, Fossil -- South America. en_US
dc.subject.lcsh Paleontology -- Paleogene -- South America. en_US
dc.subject.lcsh Paleontology -- South America. en_US
dc.title The origin and affinities of the South American Condylarthra and early Tertiary Litopterna (Mammalia). American Museum novitates ; no. 2772 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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