Echinolittorina mespillum is a species of sea snail, a marine gastropod mollusk in the family Littorinidae, the winkles or periwinkles. Distribution Aruba, Bonaire, Caribbean Sea, Cayman Islands, Colombia, Cuba, Curaçao, Gulf of Mexico, Jamaica, Lesser Antilles, Mexico, Puerto Rico Description The maximum recorded shell length is 10 mm. Habitat Minimum recorded depth is −2 m. Maximum recorded depth is 0 m. References Littorinidae Gastropods described in 1824