A forest-dwelling Oecomys mouse with a thick, silky coat. Its back ranges from ochre-brown to dark reddish brown, with paler flanks.
The back ranges from ochre-brown to dark reddish brown; the flanks are paler and the coat is long and silky.
In a diet study in Maranhão’s Cerrado, plant material and beetles were frequent food items.
The dorsal fur is 8–10 mm long.
The tail is dark brown all around, with hairs lengthening toward the tip to form a modest terminal tuft.
An extinction-risk assessment has not been added yet.