By Maassen (2002)
"shell conical, sinistroid, with flat to slightly convex sides. Apex slightly oblique sometimes. Whorls 6 1/2, convex; last whorl rounded. Constriction with a parietalis, and both a longitudinal and transversal palatalis; a columellaris is absent. Tuba abruptly narrowed towards the constriction, (slightly_ angular below. Apical whorls smooth; the following ones with very sharp radial ribs, which are rather widely spaced (7-8 ribs/1mm on the penultimate whorl). The ribs on the tuba moderately to widely spaced (6-7 ribs/ 1mm haldway the tuba); on the spire and on the tuba slightly sinuous. Spiral striation absent. Umbilicus open, measuring 0.1 mm in diameter. Aperture hardly tilted with regard to the coiling axis, more or less circular to elliptic. Peristome double. Outer peristome spreading far beyond the inner one, but distinctly so only at the parietal and the basal side; absent along the right side of the aperture. Inner peristome distinctly protruding from the outer one for about 0.3 mm, slightly spreading. Dimensions: H 2.8-3.1 mm, B 1.5-1.6 mm (without tuba); B 2.4-2.6 mm with tuba."