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 Loukozoa (Cavalier-Smith, 1999) Cavalier-Smith, 2002 see Infrakingdom Excavata T. Cavalier-Smith, 2002
         Phylum Loukozoa Cavalier-Smith, 1999
           Anaeromonadea Cavalier-Smith, 1997
             Oxymonadida Grassé, 1952 - oxymonads