| littorina | <marine biology> A genus of small pectinibranch mollusks, having thick spiral shells, abundant between tides on nearly all rocky seacoasts. They feed on seaweeds. The common periwinkle is a well-known example. See Periwinkle. (19 Mar 1998) |
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| littorina | type genus of the family Littorinidae: periwinkles |
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