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European limpets (Patella vulgata) with acorn barnacles (Balanus balanoides)—Neville Fox-Davies/Bruce Coleman Inc.
Any of various species of snails that have a flattened shell. Most marine species (subclass Prosobranchia) cling to rocks near shore. A common U.S. species is the Atlantic plate limpet (Acmaea testudinalis) of cold waters. Keyhole limpets have a slit or hole at the apex of the shell. Some limpets (subclass Pulmonata) live in brackish water and freshwater. See alsomollusk.
This entry comes from Encyclopædia Britannica Concise. For the full entry on limpet, visit Britannica.com.