From the IUCN Red List Species Account:

Range Description

This species is known only from Mount Nganha on the Adamawa Plateau, at 1,400-1,700m asl, in Cameroon, to which it is probably endemic.

Habitat and Ecology

This species is found along watercourses in a few narrow gallery forests, and in seepage areas in nearby grassland. Tadpoles, almost certainly of this species, have been found in rock pools in streams.

Population

It is known only from five specimens.

Population Trend

decreasing

Major Threats

This poorly known species is probably at severe risk from habitat loss due to smallholder farming activities and subsistence wood extraction.

Conservation Actions

It is not known from any protected areas and protection of the remaining habitat in the range of the species is urgently needed. Further survey work is required to establish its distribution, current population status and threats.

Red List Status

Critically Endangered (CR)

Rationale

Listed as Critically Endangered because its Extent of Occurrence is probably less than 100 km2 and its Area of Occupancy is probably less than 10km2, all individuals are in a single sub-population, and the extent of its habitat on Nganha Mountain is probably declining.

Citation

Jean-Louis Amiet 2004. Astylosternus nganhanus. The IUCN Red List of Threatened Species 2004: e.T54420A11140843. http://dx.doi.org/10.2305/IUCN.UK.2004.RLTS.T54420A11140843.en