Galapagos Species Database

Shell conical, consisting of up to 7 whorls, narrowly umbilicate to rimate, reaching 11.8-13.3 mm in height and 6.3-7 mm in width, with proportion of width to height ranging from 0.5 to 0.54 and sides convex in outline. Protoconch consisting of 1.75-2 whorls, with sculpture of fine undulating and anastomosing axial rib- lets and extremely fine spiral threads. Postembryonic whorls convex and with fine, slightly sigmoid or undulat- ing axial ribs and very fine spiral threads on the first 1.75- 2.5 postembryonic whorls, forming small beads at inter- sections with axial ribs. Sutures weakly impressed. Axial sculpture becoming increasingly more pronounced on body whorl, forming coarse, irregular folds within % turn of the aperture. Base of body whorl flattened, making the shell outline somewhat fusiform. Aperture ovate-lunate, somewhat narrowed by flattened parietal wall. When viewed from side, peristome straight, its plane forming an angle of about 30° with axis of shell. Columellar margin reflected and continuous with a thick parietal callus, basal and palatal margins simple or slightly thickened. Parietal lamella 1-2 mm in length and directed toward midpoint of the outer lip and recessed about 3 mm from outermost extent of peristome. Columellar lamella thicker and not as high as parietal lamella and usually extending to the peristome. Palatal thickening extending to edge of peri- stome. Shell light brown, sometimes with pale spiral band down middle of body whorl, with peristome white by Chambers, S. M. (1986).