Limestone outcrop at Kpg. Beratok (30.3 km SE of Kuching), Sarawak.
Plectostoma dancei dancei (Vermeulen, 1994)
Morphology:
Vermeulen (1994)'s description
"Spire conical with flat to convex sides, Apex slightly to distinctly oblique. Whorls 4 3/8 - 6, convex; last whorl rounded. Constriction with a transverse palatalis. Tuba touching the spire or free from it, gradually narrowed towards the constriction, rounded below. Radial ribs (moderately) spaced (3-5 ribs/0.5 mm on the penultimate whorl, 3-4 ribs/0.5 mm half-way on the tuba), on the spire slightly sinuous or not, but those on the last whorl and on the tuba not sinuous, spiral striation absent or inconspicuous, very fine. Umbilicus open, 0.10-0.25 mm across. Aperture tilted up to 30 degree with regard to the coiling axis, its upper margin widely below the level of the apex, circular to elliptic, often slightly angular. Peristome simple, somewhat spreading. Spire: height 1.5-2.2 mm, width 1.1-1.4 mm; index 1.1-1.6. Total width 1.9-2.6 mm. Height aperture 0.6-0.7 mm; width 0.5-0.7 mm."
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith