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  Animalia
      Arthropoda
        Crustacea
            Malacostraca
              Eumalacostraca
                  Peracarida
                    Amphipoda
                      Hyperiidea
                        Physocephalata
                          Vibilioidea
                            Paraphronimidae
                                     Paraphronima
                                             Paraphronima crassipes
                                             Paraphronima gracilis