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5 May 2016 A new species of arboreal rat, genus Oecomys (Rodentia, Cricetidae) from Chaco
Ulyses F. J. Pardiñas, Pablo Teta, Jorge Salazar-Bravo, Phil Myers, Carlos A. Galliari
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Abstract

A new species of rodent is added to the highly diverse genus Oecomys (Cricetidae, Sigmodontinae, Oryzomyini) based on specimens collected in the Argentinian provinces of Chaco and Formosa. The new species is characterized by a derived carotid circulatory pattern, a feature shared with O. concolor, O. mamorae, and O. sydandersoni. A unique combination of morphological, morphometric, and molecular characters, however, provides unambiguous evidence of its validity as a separate entity. Individuals of the new species are larger than other representatives of Oecomys, and their skulls have wide and cuneate interorbital regions with well-developed supraorbital shelves, long incisive foramina, long palates, absent alisphenoid struts, and broad Eustachian tubes. This new Oecomys appears to be endemic to the Humid Chaco, an ecoregion listed as Vulnerable due to the human impact. Preliminary observations suggest that several specimens from Eastern Paraguay and the Brazilian Pantanal could also be assigned to the new species described herein.

© 2016 American Society of Mammalogists, www.mammalogy.org
Ulyses F. J. Pardiñas, Pablo Teta, Jorge Salazar-Bravo, Phil Myers, and Carlos A. Galliari "A new species of arboreal rat, genus Oecomys (Rodentia, Cricetidae) from Chaco," Journal of Mammalogy 97(4), 1177-1196, (5 May 2016). https://doi.org/10.1093/jmammal/gyw070
Received: 7 October 2015; Accepted: 17 March 2016; Published: 5 May 2016
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