Additions to the knowledge of the land snails of Sabah (Malaysia, Borneo), including 48 new species Author Vermeulen, Jaap J. Author Liew, Thor-Seng Author Schilthuizen, Menno text ZooKeys 2015 531 1 139 http://dx.doi.org/10.3897/zookeys.531.6097 journal article http://dx.doi.org/10.3897/zookeys.531.6097 1313-2970-531-1 C845838EC9124BD8AB4E07980F91959E C845838EC9124BD8AB4E07980F91959E Taxon classification Animalia Stylommatophora Euconulidae Kaliella eurytrochus Vermeulen, Liew & Schilthuizen sp. n. Figure 60 Holotype . Malaysia , Sabah , Interior Province , Gunung Trusmadi slopes , Gua Loloposon ( RMNH.5003922 ). Examined material from Sabah. Interior Province. Gunung Trusmadi slopes, Gua Loloposon (leg. J.J. Vermeulen, V 13237). Tawau Province. Danum Valley Conservation Area, 2 km N.W. of Danum Valley Field Centre (leg. H.A. Rutjes, V 13513). Description. Shell small, rather thin, somewhat translucent or opaque, pale yellow-corneous to white, depressed-conical with approx. flat or slightly convex sides; apex rounded. Surface shiny. Whorls moderately convex, last whorl angular at the periphery, rounded above and below the periphery. Protoconch whorls convex, with numerous fine, rather densely placed radial riblets, which are most distinct below the suture; numerous approx. equally strong, densely placed spiral grooves cutting into the crests of the radial riblets. Teleoconch: Last whorl with a peripheral spiral thread coinciding with the suture of the penultimate whorl, above and below this numerous fine, moderately and regularly spaced, continuous spiral grooves. Radial sculpture: growth lines above the periphery, at somewhat irregular intervals, which are approx. as strong as the spiral sculpture, and which are most distinct just below the suture. Umbilicus closed. Dimensions: Height up to 2.65 mm; width up to 3.8 mm; diameters of the first four whorls 0.80-0.85 mm, 1.5-1.6 mm, 2.35-2.50 mm, 3.6-3.7 mm respectively; number of whorls up to 4 1/8; height aperture up to 1.5 mm; width aperture up to 2.0 mm. Figure 60-61. 60 Kaliella eurytrochus sp. n. 60A Frontal view, shell 2.6 mm high 60B Umbilical view 60C Apical view (Malaysia, Sabah, Gunung Trusmadi slopes, Gua Loloposon, RMNH.5003922, holotype) 61 Kaliella sublaxa sp. n. 61A Frontal view, shell 3.3 mm high 61B Umbilical view 61C Apical view (Malaysia, West Coast Province. Crocker Range N.P., km 54 marker on the road Kota Kinabalu-Tambunan, Gunung Mas, RMNH.5003923, holotype, aperture reconstructed). Figure 62-65. 62 Kaliella nephelophila (Tillier & Bouchet, 1988). SEM image of the third whorl (Malaysia, Sabah, Kinabalu N.P., Pakka, 3080 m alt., (BOR/MOL 2873, lost) 63 Kaliella dendrophila (Van Benthem Jutting, 1950). SEM image of the third whorl (Malaysia, Sabah, Kinabatangan River valley, Gomantong, BOR/MOL 3661, lost) 64 Kaliella punctata sp. n. SEM image of the third whorl (Malaysia, Sabah, Sepulut valley, Batu Punggul, BOR/MOL 4325) 65 Kaliella calculosa (Gould, 1852). SEM image of the third whorl (Malaysia, Sabah, Tawau Province, Danum Valley, BOR/MOL 815). Habitat in Sabah and distribution. Primary forest on limestone and sandstone soil. Alt. c. 400-1000 m. Sabah: Gunung Trusmadi; Danum Valley. Two localities. Endemic to Sabah. Cross diagnosis. Differs from Kaliella gregaria by its smaller size, at the same number of whorls. In Kaliella eurytrochus , the whorls increase less fast in width; compare the diameters of the third whorl of both species. The shell of Kaliella eurytrochus is also distinctly thicker, and less fragile. Etymology. The name refers to the inflated shell shape [eurus (Gr.) = wide; trokhos (Gr.) = wheel, a word often used for the gastropod spire].