Galapagos Species Database

The shell is conical with nearly straight outlines. Height §.5-12.0 mm, width 4.5-5.9 mm. The whorls are convex, whorl number 5.9- 7.3; the first 1.7-2.3 whorls form the embryonic shell. The umbilicus is very narrow, 0.30.4, exceptionally 0.6 mm in diameter at its opening. The color of the fresh shell is light brown. The sculpture on the embryonic whorls consists of widely separated, fine, transverse riblets, 7-13/mm at the end of the first embryonic whorl, 10-20/mm, at that of the second (PI. I, Fig. la); on the postembryonic whorls, the riblets are replaced by closely set, transverse lines and superimposed, spiral lines. From the periostracum of the spiral lines, curved periostracal hairs originate (Pl. II, Fig. 1b); the hairs fall off easily, as indicated by the fact that many brown colored, hence presumably fresh, shells lack hairs. The aperture is ellipsoid or oval, the columellar wall is fairly straight; the apertural lips are slightly or moderately reflected except for the upper part of the outer lip which is not reflected at all; they are moderately thick; there is a slight callus on the parietal wall as well; teeth and lamellae, as a rule, are absent; however, 2 specimens have a small parietal tooth and one of them bears a columellar tooth as well. It is uncertain whether this is due to hybridization with toothed species or (phenotypic) variation.