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Two new taxa (Caviomorpha, Rodentia) from the early Oligocene Tinguiririca fauna (Chile). (American Museum novitates, no. 3750)

Show simple item record Bertrand, Ornella C. Flynn, John J. (John Joseph), 1955- Croft, Darin A. Wyss, André R. 2012-07-23T17:33:17Z 2012-07-23T17:33:17Z 2012-07-20
dc.description 36 p. : ill., maps ; 26 cm. en_US
dc.description.abstract Here we describe two new caviomorphs from the early Oligocene Tinguiririca fauna of the Andean Main Range of central Chile, representing the most ancient rodents known from the mid to high latitudes of South America, and the second-oldest securely dated rodents from the continent. These two new taxa are each documented by single partial mandibles bearing largely complete dentitions. Representing two new taxa, Andemys termasi, gen. et sp. nov., and Eoviscaccia frassinettii, sp. nov., these caviomorphs are informally referred to the pan-Dasyproctidae and pan-Chinchillidae, respectively. These taxa, together with recent findings in Peru, confirm that caviomorphs were well diversified prior to the Deseadan SALMA, that they likely originated during the middle to late Eocene, but that they did not spread from the tropics until some time after the Mustersan--a well-sampled interval from which rodents are unknown in higher latitudes. Additionally, in documenting the earliest occurrence of hypsodonty among caviomorphs Eoviscaccia frassinettii, sp. nov., provides important insights into the acquisition of this common mammalian dental innovation in rodents. en_US
dc.language.iso en_US en_US
dc.publisher American Museum of Natural History. en_US
dc.relation.ispartofseries American Museum novitates, no. 3750. en_US
dc.subject Andemys termasi. en_US
dc.subject Eoviscaccia frassinettii. en_US
dc.subject Caviomorpha. en_US
dc.subject Chile. en_US
dc.subject Tinguiririca River Region (Chile) en_US
dc.title Two new taxa (Caviomorpha, Rodentia) from the early Oligocene Tinguiririca fauna (Chile). (American Museum novitates, no. 3750) en_US
dc.title.alternative Early Oligocene Tinguiririca rodents. 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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