Cerithiopsis acontiumCerithiopsis acontium is a species of very small sea snail, a marine gastropod mollusk in the family Cerithiopsidae. This species was described by the American malacologist William Healey Dall in 1889.DescriptionThe maximum recorded shell length is 8 mm.HabitatMinimum recorded depth is 183 m. Maximum recorded depth is 183 m.