Class Mammalia Linnaeus, 1758 - mammals
Order Rodentia Bowdich, 1821 - rodents
Suborder Sciurognathi (Tullberg, 1899)
see Suborder Sciuromorpha Brandt, 1855
Family Muridae Batsch, 1788 - rats, mice, hamsters, voles, lemmings, and gerbils
Subfamily Sigmodontinae Wagner, 1843
Genus Oligoryzomys Bangs, 1900
01 Oligoryzomys andinus Osgood, 1914
02 Oligoryzomys arenalis Thomas, 1913
03 Oligoryzomys chacoensis Myers & Carleton, 1981
04 Oligoryzomys delticola Thomas, 1917
05 Oligoryzomys destructor Tschudi, 1844
06 Oligoryzomys eliurus Wagner, 1845
07 Oligoryzomys flavescens Waterhouse, 1837
08 Oligoryzomys fulvescens Saussure, 1860
09 Oligoryzomys griseolus Osgood, 1912
10 Oligoryzomys longicaudatus (Bennett, 1832) - long-tailed colilargo
11 Oligoryzomys magellanicus (Bennett, 1835[1836]) - Patagonian colilargo
12 Oligoryzomys microtis J. A. Allen, 1916
13 Oligoryzomys nigripes Olfers, 1818
14 Oligoryzomys vegetus (Bangs, 1902)
15 ‡Oligoryzomys victus Thomas, 1898