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Eutherian tarsals from the late Paleocene of Brazil. American Museum novitates ; no. 2761

Show simple item record Cifelli, Richard. en_US 2005-10-06T18:11:40Z 2005-10-06T18:11:40Z 1983 en_US
dc.description 31 p. : ill. ; 26 cm. en_US
dc.description Includes bibliographical references (p. 28-31). en_US
dc.description.abstract "Disassociated eutherian proximal tarsals (astragalus, calcaneum) from Riochican (late Paleocene) fissure fills near São José de Itaboraí, Rio de Janeiro, Brazil, are described and, where feasible, are assigned to dental species from that locality, based on predicted morphology, relative size, and relative abundance. Two cingulate xenarthrans are present; one is probably a dasypodid, whereas the other may pertain to the Glyptodontidae. Ankle specializations of Carodnia vierai are unlike those of astrapotheres and Dinocerata, but similar to those of Pyrotherium and suggest reference to the Pyrotheria; Tetragonostylops apthomasi is pedally a primitive astrapothere. Notoungulate tarsals from Itaboraí, referred to Camargomendesia pristina (Henricosborniidae) and Colbertia magellanica (?Oldfieldthomasiidae), are of generalized aspect within the order, and represent a primitive morphotype from which later notoungulate families diverged. Litoptern tarsals are assigned to three species, Anisolambda prodromus, Ernestokokenia parayirunhor, and a new form; astragali and calcanea of 'condylarth' aspect are referred to Lamegoia conodonta, Victorlemoinea prototypica, and Ernestokokenia protocenica. The fact that some dentally primitive taxa (including a supposed congener of a dental and tarsal condylarth) bear the diagnostic litoptern ankle specializations, whereas others, including an advanced and dentally litoptern-like form do not, heightens the problem of distinguishing the two groups as currently recognized, and indicates that the fundamental specializations of the Litopterna are postcranial, not dental. Victorlemoinea, heretofore considered a macraucheniid litoptern but probably pertaining to the new family, Sparnotheriodontidae, shares derived pedal characters with the didolodonts; among the didolodonts, Ernestokokenia protocenica, Lamegoia conodonta, and ?Didolodus sp. seem to form a natural (monophyletic) group definable by tarsal features"--P. [1]. en_US
dc.format.extent 5649967 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. 2761 en_US
dc.subject.lcc QL1 .A436 no.2761, 1983 en_US
dc.subject.lcsh Eutheria -- Anatomy. en_US
dc.subject.lcsh Anklebone. en_US
dc.subject.lcsh Tarsus. en_US
dc.subject.lcsh Mammals, Fossil -- Brazil -- Itaboraí Region. en_US
dc.subject.lcsh Paleontology -- Paleocene -- Brazil -- Itaboraí Region. en_US
dc.subject.lcsh Paleontology -- Brazil -- Itaboraí Region. en_US
dc.title Eutherian tarsals from the late Paleocene of Brazil. American Museum novitates ; no. 2761 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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