The authors who described the species chose the specific epithet "roseveari" to honor Donovan Reginald Rosevear, "who made a significant contribution to West African bat research in the 20th century, culminating in his book The Bats of West Africa".

Despite this small size, it is the largest "pipistrelloid" (bats in the genera Afronycteris, Pseudoromicia, Laephotis, Hypsugo, Neoromicia, and Pipistrellus) in West Africa.

The fur on its ventral surface is bicolored, with the bases of individual hairs darker than their tips.

Its dental formula, typical for Pseudoromicia species, is 2.1.1.23.1.3.3, for a total of 32 teeth.

A female captured in Guinea in early March 2008 was pregnant, however, with a fetus 20 mm (0.79 in) from crown to rump.

Major threats to this species include deforestation via slash-and-burn agriculture, logging, and mining.