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Organism
  Animalia
         [Metazoa]
      Arthropoda
        Crustacea
          Multicrustacea
            Thecostraca
              Cirripedia
                Thoracica
                  Thoracicalcarea
                    Balanomorpha
                          Pachylasmatoidea
                            Pachylasmatidae
                              Pachylasmatinae
                                     Atetrapachylasma
                                             Atetrapachylasma dijonesae
                                     Tetrapachylasma
                                             Tetrapachylasma ornatum