The Yungas lowland rat occurs in Amazonia and on the eastern Andean slopes. In addition to its coat description, one nest was reported from tree roots in southeastern Ecuador.
The back is dark brown and the flanks yellowish brown. The underside is gray with pale or whitish tones, and the tail is dark brown.
One nest was found in June 2014 in Sangay National Park, Ecuador. It sat in a hollow in a tree root in dense primary forest, 1.5 m above ground.
An extinction-risk assessment has not been added yet.