periwinke
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Littorinidae — Taxobox name = Littorinidae image caption = The common periwinke Littorina littorina regnum = Animalia phylum = Mollusca classis = Gastropoda subclassis = Orthogastropoda superordo = Caenogastropoda ordo = Sorbeoconcha subordo = Hypsogastropoda… … Wikipedia