This rodent was described from French Guiana. A later checklist associates it with forest near small watercourses.
The glossy back is dark brown to black, finely flecked with tawny hairs. The underside is silvery gray with a tawny wash.
A 2026 French Guiana mammal checklist associates it with intact upland forest near small watercourses.
An extinction-risk assessment has not been added yet.