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

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


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.

Original languageEnglish
Pages (from-to)1177-1196
Number of pages20
JournalJournal of Mammalogy
Issue number4
StatePublished - Jul 25 2016


  • Argentina
  • Bolivia
  • Brazil
  • Oecomys mamorae
  • Oryzomyini


Dive into the research topics of 'A new species of arboreal rat, genus Oecomys (Rodentia, Cricetidae) from Chaco'. Together they form a unique fingerprint.

Cite this