Microcystina consobrina Van Benthem Jutting, 1959

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: 37

publication ID

http://dx.doi.org/10.3897/zookeys.531.6097

publication LSID

lsid:zoobank.org:pub:C845838E-C912-4BD8-AB4E-07980F91959E

persistent identifier

http://treatment.plazi.org/id/E68B3419-082A-1A07-7DB1-AE6F9E323076

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ZooKeys by Pensoft

scientific name

Microcystina consobrina Van Benthem Jutting, 1959
status

 

Taxon classification Animalia Stylommatophora Ariophantidae

Microcystina consobrina Van Benthem Jutting, 1959  Figure 28, 32

Microcystina consobrina  Van Benthem Jutting, 1959: 145; Liew et al. 2010: Appendix S1 in online Supporting Information. Type from Indonesia, Sumatra, Brastagi.

Examined material from Sabah.

West Coast Province. Kinabalu N.P., Kotal route between 2292 and 3112 m (leg. T.S. Liew, J. Lapidin, Safrie & Jasilin V 14326; V 14325, BOR/MOL 4003).

Description.

Shell very small, thin, translucent, pale yellowish green to yellowish brown, approx. lenticular; spire moderately elevated, conical with a rounded apex. Surface shiny, glossy below. Whorls moderately to distinctly convex. Protoconch without spiral sculpture; with fine, densely placed, low radial riblets towards the teleoconch, but slightly coarser than on the teleoconch. Teleoconch: Spiral sculpture above the periphery absent or inconspicuous, below the periphery with numerous fine, well-spaced, continuous, shallow, rather vaguely outlined grooves. Radial sculpture teleoconch: above the periphery with very fine, very densely and regularly placed, low riblets; below the periphery with some irregularly spaced growth lines only. Umbilicus open, narrow; columellar side of the peristome somewhat thickened but not covering the umbilicus. Dimensions: Height up to 1.4 mm; width up to 2.3 mm; diameters of the first three whorls 0.5-0.6 mm, 0.8-1.0 mm, 1.4-1.6 mm respectively; number of whorls up to 4 1/4; height aperture up to 1 mm; width aperture up to 1.2 mm.

Habitat in Sabah and distribution.

Primary forest on granodiorite soil, 2200-3200 m alt., elsewhere at 0-1700 m alt. Sabah: Mt. Kinabalu. Distribution: Sumatra; Bali.

Cross diagnosis.

Uniquely characterized within Group 2 by the fine and dense radial ribbing above the periphery.

Elsewhere, Lamprocystis exigua  Von Moellendorff, 1897, from Java to Flores, (see Van Benthem Jutting 1950: 447), is most similar. It differs by having a larger first whorl (diameter 0.7-0.8 mm).

Remarks.

The description includes extralimital material as well. The Kinabalu material has slightly coarser radial riblets than the type.