A peer-reviewed open-access journal ZooKeys 531: 1–139Additions (2015) to the knowledge of the land snails of Sabah (Malaysia, Borneo)... 1 doi: 10.3897/zookeys.531.6097 RESEARCH ARTICLE http://zookeys.pensoft.net Launched to accelerate biodiversity research Additions to the knowledge of the land snails of Sabah (Malaysia, Borneo), including 48 new species Jaap J. Vermeulen1, Thor-Seng Liew2, Menno Schilthuizen2,3 1 JK.art and science, Lauwerbes 8, 2318 AT Leiden, the Netherlands 2 Institute for Tropical Biology and Con- servation, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Malaysia 3 Naturalis Biodiversity Center, Darwinweg 2, 2333 CR Leiden, the Netherlands Corresponding author: Menno Schilthuizen ([email protected]) Academic editor: F. Köhler | Received 25 June 2015 | Accepted 13 October 2015 | Published 2 November 2015 http://zoobank.org/C845838E-C912-4BD8-AB4E-07980F91959E Citation: Vermeulen JJ, Liew TS, Schilthuizen M (2015) Additions to the knowledge of the land snails of Sabah (Malaysia, Borneo), including 48 new species. ZooKeys 531: 1–139. doi: 10.3897/zookeys.531.6097 Abstract We present reviews of the Sabah (Malaysia, on the island of Borneo) species of the following problematical genera of land snails (Mollusca, Gastropoda): Acmella and Anaglyphula (Caenogastropoda: Assimineidae); Ditropopsis (Caenogastropoda: Cyclophoridae); Microcystina (Pulmonata: Ariophantidae); Philalanka and Thysanota (Pulmonata: Endodontidae); Kaliella, Rahula, (Pulmonata: Euconulidae); Trochomorpha and Geotrochus (Pulmonata: Trochomorphidae). Next to this, we describe new species in previously revised genera, such as Diplommatina (Diplommatinidae); Georissa (Hydrocenidae); as well as some new species of genera not revised previously, such as Japonia (Cyclophoridae); Durgella and Dyakia (Ariophantidae); Amphidromus, and Trachia (Camaenidae); Paralaoma (Punctidae); Curvella (Subulinidae). All descriptions are based on the morphology of the shells. We distinguish the following 48 new species: Acmella cyrtoglyphe, A. umbilicata, A. ovoidea, A. nana, A. subcancellata, A. striata, and Anaglyphula sauroderma (Assimineidae); Ditropopsis davisoni, D. trachychilus, D. constricta, D. tyloacron, D. cincta, and Japonia anceps (Cyclophoridae); Diplommatina bidentata and D. tylocheilos (Diplommatinidae); Georissa leucococca and G. nephrostoma (Hydrocenidae); Durgella densestriata, Dyakia chlorosoma, Microcystina microrhynchus, M. callifera, M. striatula, M. planiuscula, and M. physotrochus (Ariophantidae); Amphidromus psephos and Trachia serpentinitica (Camaenidae); Philalanka tambunanensis, P. obscura, P. anomphala, P. rugulosa, and P. malimgunung (Endodontidae); Kaliella eurytrochus, K. sublaxa, K. phacomorpha, K. punctata, K. microsoma, Rahula delopleura, (Euconulidae); Paralaoma angusta (Punctidae); Curvella hadrotes (Subulinidae); Trochomorpha trachus, T. haptoderma, T. thelecoryphe, Geotrochus oedobasis, G. spilokeiria, G. scolops, G. kitteli, G. subscalaris, and G. meristorhachis (Trochomorphidae). Keywords Malaysia, Sabah, Borneo, terrestrial Mollusca, Mount Kinabalu Copyright Jaap J. Vermeulen et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 2 Jaap J. Vermeulen et al. / ZooKeys 531: 1–139 (2015) Table of contents Introduction ............................................................................................................. 5 Systematics ............................................................................................................... 6 Clade: CAENOGASTROPODA Cox ................................................................. 6 Family ASSIMINEIDAE H. & A. Adams ........................................................ 6 Genus Acmella Blanford, 1869 ..................................................................... 6 Acmella cyrtoglyphe Vermeulen, Liew & Schilthuizen, sp. n. ..................... 7 Acmella umbilicata Vermeulen, Liew & Schilthuizen, sp. n. ..................... 9 Acmella polita Von Moellendorff, 1887 .................................................. 10 Acmella ovoidea Vermeulen, Liew & Schilthuizen, sp. n. ........................ 12 Acmella nana Vermeulen, Liew & Schilthuizen, sp. n. ............................ 14 Acmella subcancellata Vermeulen, Liew & Schilthuizen, sp. n. ................ 14 Acmella striata Vermeulen, Liew & Schilthuizen, sp. n. .......................... 16 Genus Anaglyphula Rensch, 1932 .............................................................. 17 Anaglyphula sauroderma Vermeulen, Liew & Schilthuizen, sp. n............. 18 Family CYCLOPHORIDAE Gray ................................................................ 18 Genus Ditropopsis E.A. Smith, 1897 .......................................................... 19 Ditropopsis davisoni Vermeulen, Liew & Schilthuizen, sp. n. .................. 20 Ditropopsis trachychilus Vermeulen, Liew & Schilthuizen, sp. n. ............. 22 Ditropopsis koperbergi (Zilch, 1955)........................................................ 23 Ditropopsis tyloacron Vermeulen, Liew & Schilthuizen, sp. n. ................. 23 Ditropopsis constricta Vermeulen, Liew & Schilthuizen, sp. n. ................. 25 Ditropopsis cincta Vermeulen, Liew & Schilthuizen, sp. n. ...................... 26 Ditropopsis imadatei (Habe, 1965) ......................................................... 27 Genus Japonia Gould, 1859 ....................................................................... 28 Japonia anceps Vermeulen, Liew & Schilthuizen, sp. n............................ 28 Family DIPLOMMATINIDAE Pfeiffer ........................................................ 30 Genus Diplommatina Benson, 1849 ........................................................... 31 Diplommatina bidentata Vermeulen, Liew & Schilthuizen, sp. n. ........... 31 Diplommatina tylocheilos Vermeulen, Liew & Schilthuizen, sp. n. .......... 32 Unranked clade: NERITOMORPHA ............................................................ 32 Family HYDROCENIDAE Troschel ............................................................ 32 Genus Georissa Blanford, 1864 .................................................................. 33 Georissa leucococca Vermeulen, Liew & Schilthuizen, sp. n. .................... 33 Georissa nephrostoma Vermeulen, Liew & Schilthuizen, sp. n. ................. 34 Clade: PULMONATA Cuvier ............................................................................ 35 Family ARIOPHANTIDAE Godwin Austen ................................................. 35 Genus Durgella Blanford, 1863 .................................................................. 35 ‘Durgella’ densestriata Vermeulen, Liew & Schilthuizen, sp. n. ............... 36 Genus Dyakia Godwin Austen 1891 .......................................................... 37 Dyakia chlorosoma Vermeulen, Liew & Schilthuizen, sp. n. .................... 37 Genus Microcystina Mörch, 1872 ............................................................... 39 Additions to the knowledge of the land snails of Sabah (Malaysia, Borneo)... 3 Microcystina microrhynchus Vermeulen, Liew & Schilthuizen, sp. n. ...........40 Microcystina callifera Vermeulen, Liew & Schilthuizen, sp. n. ................. 44 Microcystina striatula Vermeulen, Liew & Schilthuizen, sp. n. ................ 44 Microcystina sinica Von Moellendorff, 1885 ........................................... 46 Microcystina consobrina Van Benthem Jutting, 1959 ............................... 49 Microcystina planiuscula Vermeulen, Liew & Schilthuizen, sp. n. ............ 50 Microcystina appendiculata (Von Moellendorff, 1893) ............................ 50 Microcystina muscorum Van Benthem Jutting, 1959 ............................... 53 Microcystina gratilla Van Benthem Jutting, 1950 .................................... 56 Microcystina physotrochus Vermeulen, Liew & Schilthuizen, sp. n. .......... 57 Family CAMAENIDAE Pilsbry ..................................................................... 59 Genus Amphidromus Albers, 1850 .............................................................. 59 Amphidromus psephos Vermeulen, Liew & Schilthuizen, sp. n. ................ 59 Genus Trachia Albers, 1860 ....................................................................... 61 Trachia serpentinitica Vermeulen, Liew & Schilthuizen, sp. n. ................ 61 Family ENDODONTIDAE Pilsbry .............................................................. 61 Genus Philalanka Godwin Austen, 1898 ................................................... 62 Philalanka tambunanensis Vermeulen, Liew & Schilthuizen, sp. n. ......... 63 Philalanka kusana (Aldrich, 1889) ......................................................... 64 Philalanka moluensis (E.A. Smith, 1893) ................................................ 67 Philalanka obscura Vermeulen, Liew & Schilthuizen, sp. n. .................... 69 Philalanka thienemanni B. Rensch, 1932 ............................................... 70 Philalanka anomphala Vermeulen, Liew & Schilthuizen, sp. n. .............. 71 Philalanka rugulosa Vermeulen, Liew & Schilthuizen, sp. n. ................... 73 Philalanka malimgunung Vermeulen, Liew & Schilthuizen, sp. n. .......... 73 Genus Thysanota Albers 1860 ..................................................................... 74 Thysanota conula (Blanford, 1865) ........................................................