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Organism
  Animalia
         [Metazoa]
      Cnidaria
            Anthozoa
              Octocorallia
                     [Alcyonaria]
                    Pennatulacea
                      Subselliflorae
                            Pennatulidae
                                     Crassophyllum
                                     Gyrophyllum
                                     Pennatula
                                           [Penna]
                                           [Phosphorella]
                                             Pennatula aculeata
                                             Pennatula borealis
                                             Pennatula fimbriata
                                             Pennatula grandis
                                             Pennatula inflata
                                             Pennatula murrayi
                                             Pennatula naresi
                                             Pennatula pearceyi
                                             Pennatula phosphorea
                                               Pennatula phosphorea californica
                                               Pennatula phosphorea phosphorea
                                             Pennatula rubra
                                     Pteroeides
                                           [Argentella]
                                           [Crispella]
                                           [Godeffroyia]
                                           [Pteromorpha]
                                           [Struthiopteron]
                                             Pteroeides expansum
                                             Pteroeides griseum
                                             Pteroeides spinosum
                                     Ptilella
                                     Ptilosarcus
                                           [Leioptilum]
                                           [Leioptilus]
                                           [Lioptilum]
                                             Ptilosarcus gurneyi
                                                   [Sarcoptilus gurneyi]
                                             Ptilosarcus quadrangularis
                                             Ptilosarcus sinuosus
                                                   [Leioptilus sinuosus]
                                             Ptilosarcus undulatus
                                                   [Leioptilum undulatum]
                                             Ptilosarcus verrillii
                                     Sarcoptilus
                                           [Sarcophyllum]
                                             Sarcoptilus grandis