From the IUCN Red List Species Account:

Range Description

This species has been recorded from mid-elevations in southern Kenya, including around Nairobi. Its overall distribution and altitudinal range are still unclear because of confusion with Mertensophryne lonnbergi and Mertensophryne mocquardi, and the range map should be regarded as provisional.

Habitat and Ecology

There is no information on its habitat and ecology, although it is apparently a savanna woodland species that presumably breeds in water.

Population

The population status of this species is unknown.

Population Trend

unknown

Major Threats

There is no information on threats to this species.

Conservation Actions

Conservation Actions
It might occur in some protected areas.

Research Required
More work is needed to resolve the taxonomic status of this species and its relatives. Further research is needed into the distribution and population status, ecology, threats, and use and trade of this species.

Red List Status

Data Deficient (DD)

Rationale

Listed as Data Deficient because there is very high uncertainty around the taxonomy of this species making it very difficult to determine its extent of occurrence, area of occupancy, status and ecological requirements.

Taxonomic Notes

This species was removed from the synonymy of M. lonnbergi by Poynton (1997) and included within M. mocquardi. However, we follow Channing and Howell (2006) in giving M. nairobiensis full species status. M. Tandy (pers. comm.) considers both M. mocquardi and M. nairobiensis to be synonyms of M. lonnbergi. More work is needed to resolve its taxonomic status.

Citation

IUCN SSC Amphibian Specialist Group 2016. Mertensophryne nairobiensis. The IUCN Red List of Threatened Species 2016: e.T136044A18367054. http://dx.doi.org/10.2305/IUCN.UK.2016-1.RLTS.T136044A18367054.en