The Southeastern Mountain Taeromys is known from Tanke Salokko in southeastern Sulawesi. It has long fur, a dark gray-speckled back, a white forehead patch, and a tail black at the base and white toward the tip.
The fur is long. The dark brown back is speckled with gray, the sides are lighter brownish gray, and a white patch marks the forehead; the underside is dark grayish brown and not sharply set off. The feet are white. The tail is black on its basal half and white on its distal half.
HMW7 lists lower and upper montane rainforest as habitat. Its species distribution is restricted in that account to Tanke Salokko in southeastern Sulawesi; central Sulawesi animals are excluded as a separate undescribed species candidate.
An extinction-risk assessment has not been added yet.