Kaliella gregaria (Tillier & Bouchet, 1988)

Vermeulen, Jaap J., Liew, Thor-Seng & Schilthuizen, Menno, 2015, Additions to the knowledge of the land snails of Sabah (Malaysia, Borneo), including 48 new species, ZooKeys 531, pp. 1-139 : 69

Taxon classification Animalia Stylommatophora Euconulidae

Kaliella gregaria (Tillier & Bouchet, 1988) Figure 59

Gunongia gregaria Tillier & Bouchet, 1988: 264. Kaliella gregaria (Tillier & Bouchet) Liew et al., 2010: Appendix S1 in online Supporting Information. Type from Malaysia, Sabah, Kinabalu N.P.

Examined material from Sabah.

West Coast Province. Kinabalu N.P., Laban Rata (leg. Schilthuizen & P. Koomen, V 13531); Bowen route between 3320 and 3376 m (leg. T.S. Liew, V 14329, BOR/MOL 6038, BOR/MOL 6039).

Description.

Shell small, very thin, somewhat translucent, greenish or brownish, depressed-conical with flat sides; apex rounded. Surface shiny. Whorls moderately convex, last whorl angular and slightly compressed at the periphery, rounded above and below the periphery. Protoconch whorls convex, with numerous fine, rather densely placed radial riblets; spiral sculpture subordinate and inconspicuous (visible at 40 times magnification), numerous very densely placed grooves. Teleoconch: Last whorl with a peripheral spiral thread coinciding with the suture of the penultimate whorl, above and below this numerous continuous, fine, densely and regularly placed spiral grooves. Radial sculpture: above the periphery rather distinct, irregularly spaced, somewhat raised growth lines, next to these fine, densely and regularly placed (about as densely as the spiral grooves) riblets; below the periphery with similar but less distinct radial sculpture. Umbilicus closed. Dimensions: Height up to 5.2 mm; width up to 6.8 mm; diameters of the first three whorls c. 0.75 mm, c. 1.65 mm, c. 3.25 mm respectively; number of whorls up to c. 4, height aperture up to 3.4 mm; width aperture up to 4 mm.

Habitat in Sabah and distribution.

Subalpine forest on diorite bedrock. Alt. 3300-3400 m. Sabah: Mount Kinabalu (summit trail area). Endemic to Sabah.

Cross diagnosis.

The whorls increase faster in width than in any other Borneo Kaliella species. In this respect Kaliella sublaxa is most similar.