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 also mollusk.

This entry comes from Encyclopædia Britannica Concise.
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