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  Animalia
      Arthropoda
        Crustacea
            Malacostraca
              Eumalacostraca
                  Eucarida
                    Decapoda
                      Pleocyemata
                        Thalassinidea
                          Axioidea
                            Calocarididae
                                     Ambiaxius
                                             Ambiaxius aberrans
                                             Ambiaxius alcocki
                                             Ambiaxius franklinae
                                             Ambiaxius japonicus
                                     Calastacus
                                             Calastacus colpos
                                             Calastacus laevis
                                             Calastacus mexicanus
                                             Calastacus stilirostris
                                     Calaxiopsis
                                             Calaxiopsis felix
                                             Calaxiopsis serrata
                                     Calocaris
                                             Calocaris barnardi
                                             Calocaris caribbaeus
                                             Calocaris granulosa
                                                   [Calocaris granulosus]
                                             Calocaris investigatoris
                                                   [Calastacus investigatoris]
                                             Calocaris isochela
                                             Calocaris macandreae
                                             Calocaris templemani
                                     Eucalastacus
                                             Eucalastacus torbeni
                                     Lophaxius
                                             Lophaxius rathbunae