Rhinolophus pusillus Temminck, 1834

Suyanto, Agustinus & Struebig, Matthew J., 2007, Bats of the Sangkulirang limestone karst formations, East Kalimantan - a priority region for Bornean bat conservation, Acta Chiropterologica 9 (1), pp. 67-95 : 86

Rhinolophus pusillus Temminck, 1834

Least horseshoe bat

New material

2♂♂ ( MZB M26746 / 26747 ), 2♀♀ ( MZB M26748 / 26764 ) .

Records from Borneo

Sabah: Maliau Basin (Yasuma and An- dau, 2000). EastKal: Sungai Karangan (Sangkulirang peninsula); Gunung Kom- beng ( Yasuma, 1994); Sungai Lesan PF (M. J. Struebig, unpublished data).

Comments

This species was captured in abundance in harp-traps set at the Tabalar, Marang and Tintang formations, and was found roosting in disturbed and undisturbed caves at each of the sites ( Table 1 ). Elsewhere in Borneo it is only known from a few sites in Sabah and East Kalimantan, with the type locality being at the Karangan river on the south of the Sangkulirang peninsula. Sangkulirang is still a stronghold for this species which has a limited distribution in Borneo. We found little morphological variation among specimens from Sang- kulirang and those from Indochina in the HZM, but suggest further taxonomic study comparing to species such as R. lepidus and R. refulgens . From external observations, the connecting process of the Sangkulirang R. pusillus is distinct from R. lepidus captured in Peninsular Malaysia (M. J. Struebig, personal observation), by being more acute in its triangular shape, as reported by Csorba et al. (2003). However, we have been unable to compare speci- mens directly. Eight subspecies of R. pusil- lus are recognised (reviewed in Csorba et al., 2003), so it is likely that phylogenetic analysis will be more informative, and may suggest specific differences as has been pro- posed in Lao PDR (Francis et al., 1999).