Echinolittorina mespillum is a species of sea snail, a marine gastropod mollusc 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.Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence". PLOS One 5(1): e8776. .
Habitat Minimum recorded depth is −2 m. Maximum recorded depth is 0 m.
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