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  Animalia
    Radiata
      Cnidaria
        Anthozoa
              Octocorallia
                     [Alcyonaria]
                    Pennatulacea
                      Subselliflorae
                            Pennatulidae
                                     Pennatula
                                             Pennatula aculeata
                                             Pennatula borealis
                                             Pennatula phosphorea
                                               Pennatula phosphorea californica
                                               Pennatula phosphorea phosphorea
                                     Ptilosarcus
                                             Ptilosarcus gurneyi
                                             Ptilosarcus quadrangularis
                                             Ptilosarcus sinuosus
                                             Ptilosarcus undulatus
                                             Ptilosarcus verrillii