The rock-dwelling giant rat is rarely recorded in New Guinea. It has gray upperparts, a white underside, and a white distal half of the tail. Natural history records are sparse; it is described as terrestrial in rocky places.
Its upperparts are gray and its underside is white. The distal half of the tail is also white, with overlapping scale rings.
Very little is known about its habits. Expert references describe it as terrestrial in rocky habitats and suggest that it may eat fruit.
An extinction-risk assessment has not been added yet.