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  Animalia
      Arthropoda
        Crustacea
            Malacostraca
              Eumalacostraca
                  Eucarida
                    Decapoda
                      Pleocyemata
                        Palinura
                               [Palinuridea]
                          Eryonoidea
                            Polychelidae
                                     Cardus
                                             Cardus crucifer
                                     Homeryon
                                             Homeryon asper
                                     Pentacheles
                                             Pentacheles laevis
                                                   [Polycheles granulatus]
                                             Pentacheles snyderi
                                             Pentacheles validus
                                                   [Polycheles validus]
                                     Polycheles
                                           [Eryoneicus]
                                           [Stereomastis]
                                             Polycheles crucifer
                                             Polycheles nanus
                                                   [Stereomastis nana]
                                             Polycheles pacificus
                                             Polycheles perarmatus
                                             Polycheles sculptus
                                                   [Eryoneicus faxoni]
                                                   [Stereomastis sculpta]
                                             Polycheles surdus
                                             Polycheles typhlops
                                                   [Pentacheles agassizii]
                                     Willemoesia
                                           [Deidamia]
                                             Willemoesia forceps