Bivalvia
      Heterodonta
                  Myoida
                              Gastrochaenoidea
                                    Gastrochaenidae
                              Hiatelloidea
                                    Hiatellidae
                              Myoidea
                                    Corbulidae
                                    Erodonidae
                                    Myidae
                              Pholadoidea
                                    Pholadidae
                                    Teredinidae