Pteriomorphia

                  Arcoida
                              Arcoidea
                                    Arcidae
                                    Cucullaeidae
                                    Noetiidae
                                    Parallelodontidae
                              Limopsoidea
                                    Glycymerididae
                                    Limopsidae
                                    Manzanellidae
                                    Philobryidae
                  Limoida
                              Limoidea
                                    Limidae
                  Mytiloida
                              Mytiloidea
                                    Mytilidae
                  Ostreoida
                        Ostreina
                              Dimyoidea
                                    Dimyidae
                              Ostreoidea
                                    Gryphaeidae
                                    Ostreidae
                              Plicatuloidea
                                    Plicatulidae
                        Pectinina
                              Anomioidea
                                    Anomiidae
                              Pectinoidea
                                    Pectinidae
                                    Propeamussiidae
                                    Spondylidae
                  Pterioida
                              Pinnoidea
                                    Pinnidae
                              Pterioidea
                                    Isognomonidae
                                    Malleidae
                                    Pteriidae
                                    Pulvinitidae