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  Animalia
    Radiata
      Cnidaria
        Anthozoa
              Octocorallia
                     [Alcyonaria]
                    Pennatulacea
                      Sessiliflorae
                            Protoptilidae
                                     Distichoptilum
                                             Distichoptilum gracile
                                             Distichoptilum verrilli
                                     Protoptilum
                                             Protoptilum carpenteri
                                             Protoptilum thomsoni