This small mouse has clay-colored underparts. Known records are limited to river localities in southeastern Nicaragua; a specimen reported in 1971 was caught in dense cane on a riverbank.
Its fur is short and dense, with brown upperparts. A pale band runs along the sides; the clay-colored belly has gray hair bases. The hands and feet are dull whitish, and the tail is gray above and pale below.
The specimen reported in 1971 was caught in dense cane on the south bank of the Río Mico at El Recreo. That capture site alone does not establish an aquatic way of life.
An extinction-risk assessment has not been added yet.