Order Chiroptera - Family Vespertilionidae Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 1 451 529 book chapter 0-8018-8221-4 10.5281/zenodo.7316519 Neoromicia helios (Heller 1912) [Neoromicia] helios ( Heller 1912 ) , Smithson. Misc. Coll., 60 (12): 3 . Type Locality: Kenya , 30 mi S Mt. Marsabit , Merelle Water. Vernacular Names: Samburu Pipistrelle . Distribution: Kenya , Somalia , Djibouti , NE Uganda , extreme S Sudan , N Tanzania . Maybe more widespread ( Peterson, 1987 ). Conservation: IUCN 2003 – Not evaluated; not considered in IUCN / SSC Action Plan (2001). Discussion: Considered to be a subspecies of nanus by some authors, but differences in bacular morphology ( Hill and Harrison, 1987 ), roosting and social behavior (O'Shea, 1980; Happold and Happold, 1996 ), habitat and pelage coloration, and the presence of a pair of glands on the interfemoral membrane in helios (O'Shea, 1980) that are rarely found in nanus indicate that helios is a distinct species (M. Happold, pers. comm.).