Kingdom Protozoa Goldfuss, 1818 - protozoa
   Subkingdom Corticata Lankester, 1878 see Subkingdom Biciliata
     Infrakingdom Excavata T. Cavalier-Smith, 2002 see Supergroup Excavata Cavalier-Smith, 2002
       Superphylum Discicristata Cavalier-Smith, 1998
         Phylum Euglenozoa Cavalier-Smith, 1981
           Subphylum Saccostoma T. Cavalier-Smith, 1998 see Phylum Euglenozoa Cavalier-Smith, 1981
             Class Kinetoplastea Honigberg, 1963
               Order Bodonida Hollande, 1952
                 Genus Rhynchomonas Klebs, 1893