Central Taxonomic Thesaurus
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  Animalia
      Annelida
            Clitellata
              Oligochaeta
                    Branchiobdellida
                            Bdellodrilidae
                                     Adenodrilus
                                             Adenodrilus hemophagus
                                     Bdellodrilus
                                             Bdellodrilus illuminatus
                                                   [Branchiobdella illuminata]
                                             Bdellodrilus tetradonta
                                     Cronodrilus
                                             Cronodrilus ogygius