Bats of the Sangkulirang limestone karst formations, East Kalimantan - a priority region for Bornean bat conservation Author Suyanto, Agustinus Museum Zoologicum Bogoriense, Widyasatwaloka Building, Jl. Raya Bogor Km 46, Cibinong 16911, Indonesia Author Struebig, Matthew J. School of Biological and Chemical Sciences, Queen Mary, University of London, London, E 1 4 NS, United Kingdom & Corresponding author: E-mail: m. struebig @ qmul. ac. uk m.struebig@qmul.ac.uk text Acta Chiropterologica 2007 2007-04-01 9 1 67 95 journal article 21493 10.3161/1733-5329(2007)9[67:botslk]2.0.co;2 d40d94a8-75f5-486c-a377-6c1c7ba067dc 1733-5329 3944605 Rhinolophus sp. New material 1♂ ( MZB M26375 ). Comments A single male horseshoe bat was cap- tured in a harp-trap at the Baai formation, and was tentatively identified as R. arcuatus by the connecting process originating dis- tinctly from the tip of the sella. However, the appearance of the connecting process is distinct from that portrayed in Csorba et al . (2003) from the Philippines , and from the specimens from Sarawak held in the NHM (L. Ruedas, personal observation). It is also distinct from all of the specimens we list as R. affinis from Universitas Mulawarman Samarinda and MZB. There is little material available for R. arcuatus in Borneo since it is only recorded with certainty from the Bau area in Sarawak . This specimen is under further investigation, and may repre- sent a separate taxon to R. arcuatus and R. affinis .