Tectarius grandinatus is a species of sea snail, a marine gastropod mollusk in the family Littorinidae, the winkles or periwinkles. Description Distribution 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. Littorinidae Gastropods described in 1791