The Patellogastropoda, common name true limpets and historically called the Docoglossa, are members of a major phylogenetic group of marine gastropods, treated by experts either as a clade or as a tax
Patellidae
…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.) The largest known limpet in the world is Scutellastra mexicana that can reach 35.5 cm (14.0 in) in length…
Limplets various examples
Ventral view of Patella rustica showing its foot and head with tentacles.