Plectostoma stellasubis

Spire conical with flat sides. Apex slightly oblique or not. Tuba abruptly narrowed towards the constriction, angular below. Radial ribs on the spire rather closely placed. Aperture tilted 40-50 degrees with regard to the coiling axis, its upper margin widely above the level of the apex, circular to elliptic. Peristome touching the spire, double; outer peristome widely spreading beyond the inner but on the side which touches the spire with a deep sinus flanked at both sides by a distinct, widely rounded wing; inner peristome not or hardly protruding from the outer, spreading.