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The name Limpet is used for many kinds of mostly saltwater but also freshwater snails, specifically those that have a simple shell which is more or less broadly conical in shape, and which is either not coiled, or appears not to be coiled, in the adult snail. Thus the word "limpet" is an inexact term, which is fairly often used as part of the common name of a wide variety of different marine and freshwater gastropod species, some of which have gills and some of which have a lung. The name is given on the basis of a limpet-like or "patelliform" shell, but the several groups of snails which have such a shell are not at all closely related to one another. The phrase "true limpets" is used only for marine limpets in the ancient clade Patellogastropoda. This article is primarily about the patellogastropods, the true limpets. In the latest taxonomy the true limpets, the Patellogastropoda, have become an unranked taxon as a separate clade. Families that are exclusively fossil are indicated with a dagger †
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