This small mouse is uniformly blackish brown, including its tail and feet, with little contrast between the upper and lower sides. It has been recorded in coastal rainforests of southern Chile and in Argentina.
Its fur is uniformly blackish brown, including the tail and feet, with little or no countershading. The ears are small and sparsely haired.
It is active both by day and night. Its diet includes substantial amounts of fungi, along with arthropods, foliage, seeds, and fruits.
An extinction-risk assessment has not been added yet.