| Oligoryzomys chacoensis | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia | 
| Phylum: | Chordata | 
| Class: | Mammalia | 
| Order: | Rodentia | 
| Family: | Cricetidae | 
| Genus: | Oligoryzomys | 
| Species: | O. chacoensis | 
| Binomial name | |
| Oligoryzomys chacoensis (Myers and Carleton, 1981) | |
Oligoryzomys chacoensis, also known as the Chacoan colilargo or Chacoan pygmy rice rat, is a rodent species from South America. It is found in the Gran Chaco region of southeastern Bolivia, southwestern Brazil, Paraguay, and northeastern Argentina. Its karyotype has 2n = 58 and FNa = 74.
It is one of the hosts of the hantavirus serotype Bermejo.