This rat is known from Gag Island in Indonesia’s West Papua. It lives in forest and was assessed as Critically Endangered in 2024; no population study or detailed ecological study is available.
Field colors recorded before preservation were light brown and ashy gray on the back, white on the chin, rufous to tawny on the throat, brown to patchy light brown on the chest, and cream on the abdomen. Back and underside contrasted sharply along the flanks.
The IUCN assessment lists forest on Gag Island as habitat. It infers that an open-pit nickel mine covering about one third of the island is reducing forest habitat quality.
An extinction-risk assessment has not been added yet.