This small mouse has a slender body and a long tail. It lives in the Puna and Altiplano highlands of South America.
It has a slender body and dense, silky fur. The back is tawny to orange brown, the underside is white to cream, and a dark tuft tips the tail, which is longer than the head and body.
It is active at night and shelters in caves by day. It forages in open areas for insects and other small invertebrates as well as seeds. Hairy pads on its feet help it move over sand.
An extinction-risk assessment has not been added yet.