This rat is known from its type locality in Argentina’s Atuel river system. It has a reddish-brown back and whitish underparts. The 2017 species account suggests that it is rare or could be extinct.
The back is reddish brown, while the underside is whitish; the throat, chest, and inguinal region are described as white.
The 2017 account lists the Atuel river system in a semiarid region modified by agriculture as its habitat and describes an amphibious lifestyle.
An extinction-risk assessment has not been added yet.