Common periwinkle
The common periwinkle or winkle (Littorina littorea) is a small intertidal snail species. It has a mantle, gills and a shell with an operculum, and therefore is a marine gastropod classified within the family Littorinidae, the periwinkles. This is a robust intertidal species with a dark and sometimes banded shell. It is native to the rocky shores of the northeastern, and introduced to the northwestern, Atlantic Ocean.
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