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Organism
  Animalia
      Arthropoda
            Malacostraca
                    Decapoda
                      Pleocyemata
                        Brachyura
                         Eubrachyura
                         Thoracotremata
                          Grapsoidea
                            Sesarmidae
                                     Aratus
                                             Aratus pisonii
                                     Armases
                                             Armases cinereum
                                             Armases ricordi