Nycteribiidae of the true flysuperfamilyHippoboscoidea are known as "bat flies", together with their close relatives the Streblidae. As the latter do not seem to be a monophyletic group, it is conceivable to unite all bat flies in a single family.1
They are flattened, spiderlike flies without eyes or wings, and are seldom encountered by general collectors, as they almost never leave the bodies of their hosts. Both males and females take blood meals, thus they qualify as real parasites. Claims made in the literature that they feed on skin cells, such as in Australian flying foxes, have circulated widely but are incorrectverification neededcitation needed. Most species are highly host-specific. The family is primarily found in the Old Worldtropics; a few of the roughly 250 species occur in the Neotropics and in Europe
Petersen, Frederik Torp; Meier, Rudolf; Kutty, Sujatha Narayanan & Wiegmann, Brian M. (2007): The phylogeny and evolution of host choice in the Hippoboscoidea (Diptera) as reconstructed using four molecular markers. Mol. Phylogenet. Evol.45(1): 111–122. doi:10.1016/j.ympev.2007.04.023 (HTML abstract)
Further reading
Bertola, P.B.; Aires, C.C.; Favorito, S.E.; Graciolli, G.; Amaku, M. & Pinto-da-Rocha, R. (2005): Bat flies (Diptera: Streblidae, Nycteribiidae) parasitic on bats (Mammalia: Chiroptera) at Parque Estadual da Cantareira, São Paulo, Brazil: parasitism rates and host-parasite associations. Memórias do Instituto Oswaldo Cruz100(1): 25-32. doi:10.1590/S0074-02762005000100005PDF fulltext
Graciolli, G. & Moura, M.O. (2005): Basilia quadrosae sp. nov. (Diptera: Nycteribiidae), member of the ferruginea group, from southern Brazil. Zootaxa1087: 33–38. PDF abstract and first page text
Graciolli, G.; Passos, F.C.; Pedro, W.A. & Lim, B.K. (2002): Records of Streblidae and Nycteribiidae (Diptera) on vespertilionid bats (Chiroptera: Vespertilionidae) from São Paulo State, Brazil. Journal of the New York Entomological Society110(3): 402-404. DOI:10.1664/0028-7199(2002)110[402:ROSAND]2.0.CO;2 HTML abstract
Graciolli, G.; Dick, C.W. & Gettinger, D. (2006): A faunal survey of nycteribiid flies (Diptera: Nycteribiidae) associated with bats in Paraguay. Zootaxa1220: 35-46. PDF fulltext
Graciolli, G.; Autino, A.G. & Claps, G.L. (2007): Catalogue of American Nycteribiidae (Diptera, Hippoboscoidea). Revista Brasileira de Entomologia51(2): 142-159. doi:10.1590/S0085-56262007000200004PDF fulltext