The tail is sparsely haired and is bicoloured, being dark above and pale beneath.

The ears are small and rounded, and the hind feet are slender and have naked soles, the central three of the five claws being considerably longer than the outer ones.

[4] N. minutus is found in the Amazon basin in western Brazil and eastern Peru.

Its range includes the middle and lower basin of the Juruá River in Amazonas State, and the adjoining part of Loreto Region in Peru.

[4] Breeding takes place in both the dry and the wet season, and seems to start at a young age, as some reproductively active individuals still have unworn teeth and have not fully shed their juvenile fur.