Galapagos Species Database

The shell has a highly elevated spire, with oval outlines; however, often a slight concavity is noticeable at the second and third whorls. Shell height 15.0-16.7 mm, width 9.0-10.0 mm. There are 6.2-6.7 moderately convex whorls; the body whorl is large, it makes up 68-72% of the total height of the shell; the embryonic shell consists of 1.8—2.1 whorls. The umbilicus although wider than usual in Galapagos Naesiotus, is still narrow, 1.3-3.2 mm in diameter. The fresh shell is of brown color; the shells of living specimens have not been seen, however. The sculpture of the embryonic whorls is composed of widely spaced, fine, transverse rib- lets, 10-12 per mm at the end of the first whorl, 12-16, at that of the second (PI. II, Fig. 5); the postembryonic whorls bear irregularly spaced, broad, low striae and weak, intermittent spiral lines. The aperture is large, oval shaped except that the joint of the basal and columellar lips is somewhat angular; this angularity corresponds to a crest that forms the base of the last whorl; the outer and basal lips are sharp, not reflected, while the columellar lip is moderately thick and reflected; a slight callus is present on the parietal wall; teeth and lamellae are absent.