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Organism
  Animalia
      Mollusca
            Gastropoda
              Prosobranchia
                    Neogastropoda
                            Thaididae
                                     Morula
                                             Morula nodulosa
                                                   [Morula ferruginosa]
                                                   [Pascula ferruginosa]
                                                   [Trachypollia nodulosa]
                                     Purpura
                                             Purpura haemastoma
                                             Purpura patula
                                             Purpura thalessa