Additions to the knowledge of the land snails of Sabah (Malaysia, Borneo), including 48 new species Vermeulen, Jaap J. Liew, Thor-Seng Schilthuizen, Menno ZooKeys 2015 531 1 139 4CXW6 http://zoobank.org/026E5587-0FEE-48DF-9A8D-CC8301FB8172 Vermeulen, Liew & Schilthuizen Gastropoda Punctidae Paralaoma CoL Animalia Paralaoma angusta Stylommatophora 91 92 Mollusca species angusta  Taxon classification Animalia Stylommatophora Punctidae    Holotype. Malaysia, Sabah, West Coast Province, Crocker Range, Kiansom Waterfall( RMNH.5003958).  Examined material from Sabah. West Coast Province. Kiansom Waterfall in foothills of Crocker Range (leg. UMS Tropical Malacology Course, 2005, V 12736).  Description. Shell minute, thin, slightly translucent, yellowish brown, low-conical to lenticular, apex rounded. Surface shiny. Whorls well-rounded. Protoconch sculpture: densely placed radial riblets which are particularly distinct towards the periphery; fine, rather densely placed spiral grooves cutting into the crests of the radial riblets. Teleoconch, radial sculpture: locally distinct, widely spaced radial ribs, often with a periostracal crest, which gradually disappear towards the umbilicus; in between these very fine, densely placed, low secondary riblets above the periphery. Spiral sculpture teleochonch: spiral threads, as fine and as densely placed as the secondary radial riblets, above the periphery, grading into widely spaced, rather distinct grooves towards the umbilicus. Umbilicus narrow, 5-6 % of the shell width. Dimensions: height up to 1.1 mm; width up to 1,6 mm; diameter of the first three whorls 0.40-0.45 mm, 0.75-0.80 mm, 1.25-1.30 mm respectively; number of whorls up to 3 3/4, height aperture up to 0.75 mm; width aperture up to 0.90 mm.  Figure 76-77. 76 Paralaoma angustasp. n. 76A Frontal view, shell 1.1 mm high 76B Umbilical view (Malaysia, Sabah, West Coast Province, Crocker Range, Kiansom Waterfall, RMNH.5003958, holotype, shell partly reconstructed) 77 Curvella hadrotessp. n. 77A Frontal view, shell 7.8 mm high 77B Same shell, right lateral view (Malaysia, Sabah, Tawau Province, Danum Valley Conservation Area, 2 km NW of Research Station, BOR/MOL 663, holotype).  Habitat in Sabah and distribution. Secondary forest on sandstone hills, lowland conditions. Sabah: West Coast, one locality known. Endemic to Sabah.  Cross diagnosis. Characterized within the genus by the narrow umbilicus, the presence of radial riblets on the protoconch, and the distinct and widely spaced spiral sculpture on the lower surface.  Etymology. The name refers the the narrow umbilicus [angustus (L.) = narrow]. 2015-01-01 2015-12-31 2015-01-01 RMNH Malaysia http://data.biodiversitydata.nl/naturalis/specimen/RMNH.5003958 West Coast Province Sabah RMNH. 5003958 1 holotype