limpet(redirected from Patellogastropoda)
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limpet, marine gastropod mollusk with a simple, flattened, conical shell, found in cooler waters of the Atlantic and the Pacific oceans. Certain species creep over rocks, feeding on algae during high tides, but when the tide recedes they return instinctively to the same spot occupied previously, to await the return of high water. The muscular foot clings so powerfully that limpets are found in wave-swept areas where few other forms of life can survive. The keyhole limpet is named for its central opening, through which respiratory currents pass. Limpets range up to 4 in. (10 cm) in length, but most are smaller; there are several freshwater species. Limpets are classified in the phylum Mollusca, class Gastropoda, order Archeogastropoda.
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Any of several species of marine gastropod mollusks composing the families Patellidae and Acmaeidae which have a conical and tentlike shell with ridges extending from the apex to the border.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
1. any of numerous marine gastropods, such as Patella vulgata (common limpet) and Fissurella (or Diodora) apertura (keyhole limpet), that have a conical shell and are found clinging to rocks
2. any of various similar freshwater gastropods, such as Ancylus fluviatilis (river limpet)
3. a small open caisson shaped to fit against a dock wall, used mainly in repair work
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005