Bivalvia
      Pteriomorphia
                  Ostreoida
                        Ostreina
                              Dimyoidea
                                    Dimyidae
                              Ostreoidea
                                    Gryphaeidae
                                    Ostreidae
                              Plicatuloidea
                                    Plicatulidae
                        Pectinina
                              Anomioidea
                                    Anomiidae
                              Pectinoidea
                                    Pectinidae
                                    Propeamussiidae
                                    Spondylidae