Kingdom Protozoa Goldfuss, 1818 - protozoa
   Subkingdom Corticata Lankester, 1878 see Subkingdom Biciliata
     Infrakingdom Excavata T. Cavalier-Smith, 2002 see Supergroup Excavata Cavalier-Smith, 2002
       1 Superphylum Loukozoa (Cavalier-Smith, 1999) Cavalier-Smith, 2002 see Infrakingdom Excavata T. Cavalier-Smith, 2002
       1.1 Infrakingdom Loukozoa Cavalier-Smith, 1999 see Superphylum Loukozoa (Cavalier-Smith, 1999) Cavalier-Smith, 2002
       2 Superphylum Discicristata Cavalier-Smith, 1998
       3 Superphylum Archezoa Cavalier-Smith, 1983 see Infrakingdom Archezoa Cavalier-Smith, 1983