Eoacmaeoidea
                                    Eoacmaeidae
                              Lottioidea
                                    Acmaeidae
                                    Lepetidae
                                    Lottiidae
                                    Pectinodontidae
                              Nacelloidea
                                    Nacellidae
                              Neolepetopsoidea
                                    Neolepetopsidae
                              Patelloidea
                                    Patellidae