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Organism
  Animalia
      Mollusca
            Gastropoda
              Opisthobranchia
                    Notaspidea
                            Pleurobranchidae
                                     Berthella
                                             Berthella agassizii
                                             Berthella californica
                                             Berthella martensi
                                                   [Berthella kaniae]
                                             Berthella stellata
                                     Berthellina
                                             Berthellina citrina
                                             Berthellina engeli
                                             Berthellina ilisima
                                             Berthellina quadridens
                                     Pleurobranchus
                                             Pleurobranchus areolatus
                                             Pleurobranchus digueti
                                             Pleurobranchus evelinae