This species is known only from the foothills of the East Usambara Mountains in north-eastern Tanzania. All records have been from below 410m asl.
Habitat and Ecology
It is a terrestrial species of lowland forest, but also survives in mildly disturbed, selectively logged forest. Its breeding behaviour is unknown, but it might breed in puddles in tree roots (like Stephopaedes anotis).
It is not uncommon within its very small known range.
There is ongoing loss of its habitat due to agricultural encroachment, wood extraction, and human settlement.
It occurs in the Kwamgumi, Segoma and Mtai Forest Reserves, but these are not well protected and are in need of improved management.
John Poynton, Kim Howell 2004. Mertensophryne usambarae. In: IUCN 2014