Lang's red colobus occurs around Kisangani in the Democratic Republic of the Congo. Its coat is described as a sharp contrast between a gray hind body and brick-red front. Local interviews reported that it favors hill and streamside forest and mainly eats leaves.
The species account for the Kisangani red colobus describes a sharply divided coat, with a gray posterior and brick-red anterior.
In the 2019 field report, local interview respondents said the species is mainly leaf-eating and feeds on young Gilbertiodendron dewevrei foliage. The report also records interview accounts that it favors upland forest near streams.
An extinction-risk assessment has not been added yet.