Fissurelloidea
                                    Fissurellidae
                              Haliotoidea
                                    Haliotidae
                              Lepetelloidea
                                    Addisoniidae
                                    Lepetellidae
                              Lepetodriloidea
                                    Lepetodrilidae
                              Neomphaloidea
                                    Neomphalidae
                                    Peltospiridae
                              Phasianelloidea
                                    Colloniidae
                              Scissurelloidea
                                    Scissurellidae
                              Seguenzioidea
                                    Calliotropidae
                                    Chilodontidae
                                    Seguenziidae
                              Trochoidea (sf)
                                    Angariidae
                                    Calliostomatidae
                                    Liotiidae
                                    Phasianellidae
                                    Skeneidae
                                    Solariellidae
                                    Trochidae
                                    Turbinidae
                        Pleurotomariina
                              Pleurotomarioidea
                                    Pleurotomariidae