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 Plicostoma Patterson, 1988 ex T. Cavalier-Smith, 1998 see Phylum Euglenozoa Cavalier-Smith, 1981
             Class Euglenoidea Bütschli, 1884
               Order Rhabdomonadida Leedale, 1967
                 1 Genus Menoidium Perty, 1852
                 2 Genus Rhabdomonas Fresenius, 1858
                 3 Genus Distigma Ehrenberg, 1831