The Rumpi Mouse Shrew is known from the Rumpi Hills in Cameroon. Current MDD lists M. rumpii, while a 1973 specialist book used the former subspecies name M. eisentrauti rumpii and described it as darker and shorter-haired than the Bioko Island form.
A 1973 specialist book says the Rumpi form, then called M. eisentrauti rumpii, had darker coloration and shorter fur than the Fernando Poo form, now called Bioko Island.
A 2016 paper lists rainforest as the species’ habitat, using IUCN database information available in 2015.
An extinction-risk assessment has not been added yet.