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Patellidae is a taxonomic family of sea snails or true limpets, marine gastropod molluscs in the clade Patellogastropoda. Patellidae is the only family in the superfamily Patelloidea. This family has no subfamilies. (The superfamily Patelloidea should not be confused with the similar-sounding genus of true limpets Patelloida which is in the family Lottiidae within the superfamily Lottioidea, also part of the Patellogastropoda.)
They live on rocky shores. Limpets are firmly attached to the rock on which they move.
They feed by scraping algae from rocks with they radulas. Algae are mixed with the liquid from the salivary glands to easily pass through the esophagus and be digested. Some limpet species in this family are used as a food source in various countries as the one shown on the photo.