About Monodonta confusa Tapparone Canefri, 1874
The shell of Monodonta confusa can reach 20 mm in height and 18 mm in diameter. This species shares a similar shape with Monodonta labio. Its base color is pink, with longitudinal dusky clouded markings. The penultimate whorl of the shell has 5 or 6 spiral ridges, and the final whorl has 13 or 14 spiral ridges. The second ridge from the suture is very narrow. The remaining ridges are roughly equal in size, and grow smaller toward the underside of the shell. Unlike the typical condition in Monodonta labio, there are no small intercalated lirulae between the ridges on the final whorl. The ridges are clearly and regularly divided into oblong subquadrangular or lozenge-shaped grains by vertical impressions that are as deep as the groove between adjacent ridges. The basal tooth of the columella is smaller and sharper than that found in a typical Monodonta labio. This marine species is distributed off the coasts of Japan, Singapore, and the Philippines.
