Several species complexes exist within the African representatives of the genus Hipposideros and the relationships between these taxa are not yet well understood. We present evidence showing that at least seven species of Hipposideros co-occur at Mount Nimba at the northern boundary of the Upper Guinean forest zone. The species H. lamottei has been misdiagnosed previously, partly as a result of errors in published measurements. This taxon is currently known only from high-altitude grasslands in northern (Guinean) Mount Nimba. Cytochrome b sequences and echolocation calls of this species, as well as for H. marisae, are presented for the first time. Also, at least two different species groups, previously lumped in H. ruber, co-exist syntopically here. Mount Nimba apparently represents a diversity hotspot for species of Hipposideros in West Africa, and as a result may be an important site for their conservation.
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Vol. 15 • No. 2