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Organism
  Animalia
      Mollusca
            Gastropoda
              Heterobranchia
                Euthyneura
                 Ringipleura
                  Nudipleura
                    Pleurobranchida
                          Pleurobranchoidea
                            Pleurobranchidae
                                     Berthella
                                             Berthella nebula
                                     Berthellina
                                             Berthellina quadridens
                                     Pleurobranchus
                                             Pleurobranchus areolatus