This small mouse is known from Cerro Asunción, Costa Rica. Its back is dark brown, with paler sides and underparts. The 2017 account records only one specimen from the wet cloud forest at the type locality.
The back is dark brown and slightly woolly. The sides fade to buffy brown or ocherous, and the underparts are whitish pale buff.
In the 2017 species account, the type locality of the single known specimen is wet cloud forest.
An extinction-risk assessment has not been added yet.