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  Animalia
      Arthropoda
        Crustacea
            Malacostraca
              Eumalacostraca
                  Eucarida
                    Decapoda
                      Pleocyemata
                        Astacidea
                               [Astacura]
                          Astacoidea
                            Astacidae
                                     Astacus
                                             Astacus astacus
                                     Pacifastacus
                                       Pacifastacus (Hobbsastacus)
                                             Pacifastacus chenoderma
                                             Pacifastacus connectens
                                             Pacifastacus fortis
                                             Pacifastacus gambelii
                                             Pacifastacus nigrescens
                                       Pacifastacus (Pacifastacus)
                                             Pacifastacus leniusculus
                                               Pacifastacus leniusculus klamathensis
                                               Pacifastacus leniusculus leniusculus
                                               Pacifastacus leniusculus trowbridgii
                                                     [Pacifastacus trowbridgi]