Bats of the Sangkulirang limestone karst formations, East Kalimantan - a priority region for Bornean bat conservation Suyanto, Agustinus Struebig, Matthew J. Acta Chiropterologica 2007 2007-04-01 9 1 67 95 3M37H (Horsfield, 1823) Horsfield 1823 [704,1177,1533,1559] Mammalia Hipposideridae Hipposideros Animalia Chiroptera 16 82 Chordata species larvatus  Horsfield’s roundleaf bat   New material   3♂♂( MZB M26779/ 26780/ 26781);  4♀♀( MZB M26803/ 26809/ 26813/ 26850). Records from Borneo   Sarawak: Kuching ( Payne et al., 2000); Bau limestone formations (Mohd-Azlan et al., 2005). WestKal: Betung Kerihun NP (Hariuchi, 1999); Gunung Kenepai ( Payne et al., 2000); Gunung Niut NR ( Colijn, 2005); Gunung Palung NP (MZB). South- Kal: Sungai Pangalahan, Sungai Pasir ( Payne et al., 2000). EastKal: International Tropical Timber logging concession, Liang Lusan cave ( Yasuma, 1994); Sungai Lesan PF (M. J. Struebig, unpublished data).   Comments This species was a dominant roundleaf bat captured at Baai, Marang and Tintang formations. The species is known to roost in large colonies in limestone caves ( Payne etal., 2000), and during this study was record- ed in Gua Dep at the Baai formation. According to the SAMD, in Borneo H. lar- vatusis distributed from the northwest to southeast, and despite substantial surveys in karst areas, it has not been recorded from Sabah. Our records extend the known distri- bution in Borneo eastwards. However, the taxonomy of  H. larvatusis uncertain, and there have been calls for a systematic re- evaluation as there is clearly much variation across the species range. Kitchener and Maryanto (1993)suggested elevating H. l.grandis in Thailandand Vietnamto species status given its larger forearm size and dis- tinct skull, penis and baculum morphology. Thabah et al.(2006)also proposed a cryptic species among  H. larvatuscaptured in northeast India, distinguished by larger forearm size, genetic divergence and echo- location peak frequency.  H. larvatusin Sangkulirang exhibits a substantial size range (FA: 59.4–66.6 mm) and so may, giv- en these discoveries elsewhere, contain more than one species. Like Thabah et al. (2006)we advocate a reassessment of this species complex using morphological, echolocation and phylogenetic techniques. MEGADERMATIDAE 2813180330 [721,1198,1670,1697] MZB 16 82 MZB M26779, 26780, 26781 1 2813180340 [683,1197,1704,1731] MZB 16 82 MZB M26803, 26809, 26813, 26850 4 4