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Organism
  Animalia
         [Metazoa]
      Platyhelminthes
        Rhabditophora
               [Archoophora]
               [Turbellaria]
            Trepaxonemata
                    Neoophora
                           [Lecithoepitheliata]
                           [Neorhabdocoela]
                           [Prolecithophora]
                            Typhloplanidae
                                     Ascophora
                            Tessaradomidae
                                     Smithsonius
                                             Smithsonius dorothea
                                                   [Striatodoma dorothea]
                                     Striatodoma
                                     Tessaradoma
                                             Tessaradoma boreale
                                             Tessaradoma gracile