This is a small mouse recorded in central Africa. Its teeth and skull help taxonomists classify it.
A 2006 comparison placed H. parvus in a provisional parvus group, characterized by a minute or absent cusp on the first upper molar and a short rostrum.
A 1993–1994 survey in the Okapi Faunal Reserve, DRC, captured one individual and counted the species among rodents making up less than 1% each of the survey total.
An extinction-risk assessment has not been added yet.