Sinum cymba

Sinum cymba, common name the concave ear moon snail, is a species of predatory sea snail, a marine gastropod mollusk in the family Naticidae, the moon snails.
It was classified by the German malacologist Karl Theodor Menke in 1828 with the name Natica cymba.

Description

Shell with a wide opening, brown and smooth; with an external coloration of purplish-brown to pale, gray or white, on a surface with a waxy shine, provided with fine spiral lines. The spiral is low and up to 7 centimeters long, when developed; ending in a broad turn. There is no umbilical underneath. The outer lip is thin and angular.
The species lives in cold, shallow waters.

Distribution

It is common in the eastern Pacific Ocean, on the coasts of South America to Chile, including the Galápagos, and southern Central America, in Panama.

Subfamily Sininae

The Naticidae of the subfamily Sininae have a low spiral and a wide aperture or so wide that they are mistaken for abalones without perforations; they have auriform shells. They have a very small horny operculum.