Philalanka anomphala Vermeulen, Liew & Schilthuizen

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 : 58

Taxon classification Animalia Stylommatophora Endodontidae

Philalanka anomphala Vermeulen, Liew & Schilthuizen sp. n. Figure 47

Holotype. Malaysia, Sabah, West Coast Province , Kinabalu N.P. , Mesilau trail ( RMNH.5003940 ).

Examined material from Sabah.

West Coast Province. Kinabalu N.P., near Kotal route at 2376 m (leg. T.S. Liew, J. Lapidin, Safrie & Jasilin, BOR/MOL 4202, V 14335); Mesilau trail between 2112 and 2356 m (leg. T.S. Liew, BOR/MOL 4204, BOR/MOL 4206, V 14334; leg. T.S. Liew & J. Lapidin, BOR/MOL 4205); Summit trail at 2308 m (leg. T.S. Liew, BOR/MOL 4203).

Description.

Shell very small, thin, hardly translucent, yellow-corneous, low-conical with slightly convex sides; apex somewhat flattened. Surface glossy. Whorls convex, rounded. Protoconch whorls convex; surface almost smooth, the slightest traces of a very fine (just visible at 40 times magnification), dense spiral striation, as well as some traces of radial sculpture. Teleoconch: Last whorl with a thin, inconspicuous (conspicuous in juveniles) spiral thread following the periphery and coinciding with the suture of the penultimate whorl; above this traces of very fine (just visible at 40 times magnification), rather dense spiral striation, below the periphery with a similar, but widely spaced, striation; this spiral striation subordinate to rather coarse, moderately spaced but irregularly placed, usually somewhat sunk growth lines above the periphery, radial sculpture below the periphery less conspicuous. Umbilicus closed, rimate in juveniles. Dimensions: Height up to c. 1.75 mm; width up to c. 2.3 mm; diameters of the first three whorls c. 0.75 mm, c. 1.25 mm, c. 1.9 mm respectively; number of whorls up to c. 3 5/8; height aperture up to 1.0 mm; width aperture up to 1.2 mm.

Habitat in Sabah and distribution.

Montane forest on sandstone soil. Alt. 2100-2400 m. Sabah: Mount Kinabalu. Endemic to Sabah.

Cross diagnosis.

Differs from Philalanka rugulosa and Philalanka malimgunung , as well as from the similar looking species Philalanka lieftincki Van Benthem Jutting (Indonesia, Ambon), and Philalanka micromphala Van Benthem Jutting (Indonesia, Java), by having a closed umbilicus.

Etymology.

The name refers to the absence of an umbilicus [an-omphalos (Gr.) = without umbilicus].