limpet

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Related to common limpets: Patella vulgata

limpet

a marine gastropod MOLLUSC of the genus Patella that has a single, conical shell. When exposed at low water it attaches itself very firmly to the substrate, usually rocks.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005