Small-eared Colilargo
- kingdom: Animalia
- phylum: Chordata
- class: Mammalia
- order: Rodentia
- family: Cricetidae
- genus: Oligoryzomys
- species: Oligoryzomys microtis
Monteagudo
Chuquisaca- San Juan del Surutú
Santa Cruz
Bolivia
Eirunepé
Amazonas- Barra do Corda
Maranhão
Brazil
Barranca