Echinolittorina granosa is a species of sea snail, a marine gastropod mollusk in the family Littorinidae, the winkles or periwinkles. Description Distribution This species occurs in the Atlantic Ocean off Gabon. References Reid D.G. (1989) The comparative morphology, phylogeny and evolution of the gastropod family Littorinidae. Philosophical Transactions of the Royal Society B 324: 1–110. Endemic fauna of Gabon Littorinidae Gastropods described in 1845