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  Animalia
      Arthropoda
        Crustacea
            Maxillopoda
                   [Maxillipoda]
              Thecostraca
                Cirripedia
                  Thoracica
                    Sessilia
                      Balanomorpha
                          Tetraclitoidea
                            Bathylasmatidae
                                     Aaptolasma
                                             Aaptolasma americana
                                             Aaptolasma brintoni
                                             Aaptolasma callistoderma
                                             Aaptolasma leptoderma
                                             Aaptolasma triderma
                                     Bathylasma
                                             Bathylasma aucklandicum
                                             Bathylasma corolliforme
                                             Bathylasma hirsutum
                                     Hexelasma
                                             Hexelasma americanum
                                             Hexelasma fosteri
                                     Tessarelasma
                                             Tessarelasma pilsbryi
                                     Tetrachaelasma
                                             Tetrachaelasma southwardi