Order Rodentia - Family Muridae Author Guy G. Musser Author Michael D. Carleton text 1993 Smithsonian Institution Press Washington and London Editor Don E. Wilson Editor DeeAnn M. Reeder Mammal Species of the World (2 nd Edition) 501 755 book chapter http://doi.org/10.5281/zenodo.7353098 1-56098-217-9 7353098 Oligoryzomys chacoensis (Myers and Carleton, 1981) . Mise. Pubi. Mus. Zool., Univ. Michigan , 161: 19 . TYPE LOCALITY: Paraguay , Boqueron Dept., km 419 along Trans Chaco Hwy, northwest of Villa Hayes . DISTRIBUTION: Dryer habitats of W Paraguay , SE Bolivia , WC Brazil , and N Argentina . May be more broadly distributed in cerrado and caatinga habitats in SE Brazil . COMMENTS: Karyotype reported by Myers and Carleton (1981) ; morphometric variation by Myers and Carleton (1981) and Olds and Anderson (1987) . Status with regard to O. andinus unresolved.