Vermeulen (1994)'s description
"Spire conical with distinctly convex sides, almost cylindrical. Apex oblique. Whorls 4 1/8 - 4 5/8, distinctly convex; last whorl rounded. Constriction with an inconspicuous parietalis, a transverse palatalis. Tuba touching the spire over its entire length, gradually narrowed towards the constriction, rounded below. Radial ribs moderately spaced (5 ribs/0.5 mm on the penultimate whorl, as well as half-way the tuba), not sinuous. Spiral striation inconspicuous, very fine. Umbilicus open, 0.10 mm across. Aperture hardly tilted with regard to the coiling axis, its upper margin widely below the level of the apex, circular to slightly angular. Peristome touching the spire, double, outer peristome slightly to moderately spreading beyond the inner, but gradually narrowed towards, and absent or narrow along the right side of the aperture, slightly widened along the upper side or not; inner peristome moderately to distinctly protruding from the outer, moderately spreading, its outer surface and the upper surface of the outer peristome with some fine riblets or lamellae. Spire: height 1.1-1.2 mm; width 0.8 mm; index 1.4-1.5. Total wideth 1.4-1.5 mm. Height and width aperture 0.4 mm."