Kingdom Protozoa Goldfuss, 1818 - protozoa
   Subkingdom Gymnomyxa (Lankester, 1878) Cavalier-Smith, 2002 see Kingdom Protozoa Goldfuss, 1818
     Infrakingdom Rhizaria Cavalier-Smith, 2002
       1 Phylum Apusozoa Cavalier-Smith, 1997 see Clade Obazoa Brown, Sharpe, Silberman, Heiss, Lang, Simpson & Roger 2013
       2 Phylum Cercozoa Cavalier-Smith, 1998
       3 Phylum Retaria Cavalier-Smith, 2002
       4 Phylum Heliozoa Haeckel, 1866 see Subphylum Heliozoa Haeckel (1866)