The lesser marmoset rat has a tail longer than its body, ending in a tuft. A Vietnam guide reports it using bamboo internodes.
Its back is grayish to ochraceous brown, with soft dense fur and a whitish underside. The tail is longer than the body and ends in a tuft.
The Vietnam guide reports that it gnaws round holes to enter bamboo internodes and is an excellent climber.
An extinction-risk assessment has not been added yet.