Land snails and slugs of Bau limestone hills, Sarawak (Malaysia, Borneo), with the descriptions of 13 new species Author Marzuki, Mohammad Effendi bin Institute of Biodiversity and Environmental Conservation, Universiti Malaysia Sarawak, 94300, Kota Samarahan, Sarawak, Malaysia & Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, Jalan UMS, 88450, Kota Kinabalu, Sabah, Malaysia fendiemz@gmail.com Author Liew, Thor-Seng https://orcid.org/0000-0002-9437-5924 Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, Jalan UMS, 88450, Kota Kinabalu, Sabah, Malaysia thorsengliew@gmail.com Author Mohd-Azlan, Jayasilan Institute of Biodiversity and Environmental Conservation, Universiti Malaysia Sarawak, 94300, Kota Samarahan, Sarawak, Malaysia text ZooKeys 2021 2021-04-27 1035 1 113 http://dx.doi.org/10.3897/zookeys.1035.60843 journal article http://dx.doi.org/10.3897/zookeys.1035.60843 1313-2970-1035-1 ED19022EA1704DB79587FEFE15D07854 4C2258D4EE6754488B9280D3AB0447A1 Acmella nana Vermeulen, Liew & Schilthuizen, 2015 Figures 15C , 17D, E Acmella nana Vermeulen et al., 2015 : 14, fig. 5A-D. Type locality. "Malaysia, Sarawak, 4th Division, Niah Caves, Southside of limestone area, West side of the quarry, soil-filled crevice opened in quarry". Material examined. Gunung Kapor: ME 8497. Gunung Doya: ME 9091. Distribution in Borneo. Sarawak: Kuching and Miri divisions. Sabah: Interior and Sandakan divisions. Endemic to Borneo. Remarks. Only dry shells were found during the surveys. The shells from Bau population are larger than the description of the type specimen (height 0.88 mm, width 0.76 mm).