Limpet

Limpets are a group of aquatic snails with a conical shell shape (patelliform) and a strong, muscular foot. This general category of conical shell is known as "patelliform" (dish-shaped). Existing within the class Gastropoda, limpets are a polyphyletic group (its members descending from different immediate ancestors).

All species of Patellogastropoda are limpets, with the Patellidae family in particular often referred to as "true limpets". Other examples include the Vetigastropoda family Fissurellidae ("keyhole limpet"), and the Siphonariidae ("false limpets"), which use a siphon to pump water over their gills.