This wild rodent occurs in southwestern Uruguay. Its 2002 description reports records south of the Río Negro in five departments.
Its coat ranges from reddish to dark brown, sometimes with white spots on the underparts. The hind feet are large and strong, with long claws. The narrow, projecting snout is described as characteristic of the genus.
The Ramsar site summary for Laguna de Rocha says this species is strongly restricted to wetland habitat.
An extinction-risk assessment has not been added yet.