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 Ptychopatula dioscoricola (C. B. Adams, 1845) Figure 45A Helix dioscoricola C. B. Adams, 1845: 16. Type locality. "Jamaica" . Material examined. Gunung Doya: ME 8942, ME 8997. Gunung Kapor: ME 8151, ME 8502, ME 9006, ME 9027, ME 9070. Kampung Padang Pan: ME 6830. Lobang Angin: ME 9140, ME 9173. Distribution in Borneo. Sarawak: Kuching, Bintulu, Miri, and Limbang divisions. Sabah: Sandakan Division. Distribution elsewhere. Circumtropical (Pilsbry 1920-1921). Remarks. Only dry shells were found during the surveys. It differs from P. circumlitum (Hedley, 1897) and P. orcella (Stoliczka, 1873) in having a higher spired shell with an umbilicus that is partly or entirely covered by the reflected peristome. This species also differs from P. pulvisculum (Issel, 1874) in having a larger shell with spiral lirae on shell surfaces. Figure 45. A Ptychopatula dioscoricola (C. B. Adams, 1845) ME 9070 Gunung Kapor B Ptychopatula orcella (Stoliczka, 1873) ME 8925 Gunung Doya C Pupisoma moleculina (Van Benthem-Jutting, 1940) ME 9051 Gunung Kapor D Pupisoma pulvisculum (Issel, 1874) ME 9055 Gunung Kapor E Boysidia salpinx F. G. Thompson & Dance, 1983 ME 8781 Gunung Kapor. Figure 46. Living snails from Bau A Japonia barbata (L. Pfeiffer, 1855) ME 8768 Gunung Kapor B Opisthophorus euryomphalus (L. Pfeiffer, 1856) ME 8779 Gunung Kapor C Opisthophorus biciliatus Mousson, 1849 ME 8754 Gunung Kapor D Opisthophorus birostris (L. Pfeiffer, 1854) ME 8755 Gunung Kapor. All not to scale.