Abstract
In order to assess the controversial systematic position of the Savi's bat (Hypsugo savii), 43 ves-pertilionid bats belonging to 10 species were analyzed by mean of isozyme electrophoresis. The results were interpreted in two ways: first, we found that the amount of genetic differentiation between Hypsugo and the true Pipistrellus (D # 0.719) is of the same magnitude as the mean distance which separates the other pipistrelloid genera (D = 0.738). Secondly, the cladogram based on these biochemical results confirms the splitting of these “pipistrelles”, as Hypsugo is more closely related to Vespertilio than to any other palearctic genus. The other species analyzed in this study group themselves in a different clade, including Pipistrellus, Eptesicus and Nyctalus. This phylogenetic interpretation presents a testable hypothesis, which could be confirmed by an analysis of other loci or other allied species.
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