Cerithiella macrouraCerithiella macroura is a species of very small sea snail, a marine gastropod mollusk in the family Newtoniellidae. It was described by Melvill and Standen, in 1912.DescriptionThe maximum recorded shell length is 3.55 mm.HabitatMinimum recorded depth is 102 m. Maximum recorded depth is 102 m.