The result of a survey of ectoparasites infesting bats in southeastern Brazil is presented. Of 181 bats belonging to 16 species, 10 (34.1%) were infested by streblid flies (Streblidae), nine (33.5%) by spinturnicid mites (Spinturnicidae), and five (8.3%) by macronyssid mites (Macronyssidae). One species of the families Trombiculidae and Myobiidae was found. A total of 195 streblids, 178 spinturnicids, and 76 macronyssids was collected. Paratrichobius longicrus was the most abundant bat fly species (50 specimens). The spinturnicid mite Periglischrus iheringi was the most abundant ectoparasite species (159 specimens) and was recorded on three different bat species; Radfordiella desmodi was the most numerous macronyssid (69 specimens).
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