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Organism
  Animalia
      Arthropoda
        Crustacea
          Multicrustacea
            Thecostraca
              Cirripedia
                Thoracica
                  Thoracicalcarea
                    Balanomorpha
                          Chthamaloidea
                            Chthamalidae
                                     Chthamalus
                                             Chthamalus angustitergum
                                             Chthamalus fragilis