Taxon classification Animalia Stylommatophora Euconulidae

Kaliella phacomorpha Vermeulen, Liew & Schilthuizen sp. n. Figure 66

Holotype . Malaysia, Sabah, Interior Province, Gunung Trusmadi slopes, Gua Loloposon (RMNH.5003924).

Examined material from Sabah.

Interior Province. Gunung Trusmadi slopes, Gua Loloposon (leg. J.J. Vermeulen, V 13215).

Description.

Shell very small, rather thin, somewhat translucent or opaque, yellow-brown corneous, depressed-conical to almost lenticular with slightly convex sides; apex rounded. Surface shiny. Whorls moderately convex, the last whorl angular at the periphery, rounded above and below the periphery. Protoconch whorls convex, with numerous fine, densely placed radial riblets; spiral sculpture subordinate, consisting of approx. 12 very fine, 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 continuous, fine, moderately and regularly spaced, continuous spiral grooves. Radial sculpture: growth lines above the periphery only. Umbilicus open, narrow. Dimensions: Height up to 1.7 mm; width up to 2.6 mm; diameters of the first four whorls 0.55-0.65 mm, 0.95-1.10 mm, 1.45-1.60 mm, 2.05-2.30 mm respectively; number of whorls up to 4 3/4; height aperture up to 1.05 mm; width aperture up to 1.3 mm.

Habitat in Sabah and distribution.

Found in primary forest on limestone soil. Alt. 900-1000 m. Sabah: Gunung Trusmadi. Endemic to Sabah.

Cross diagnosis.

Uniquely identified among Sabah Kaliella species by its depressed-conical, almost lenticular spire.

Etymology.

The name refers to the shell shape [phakos (Gr.) = lentil; morphe (Gr.) = shape].