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 Percolozoa Cavalier-Smith, 1992
           1 Genus Vahlkampfia Chatton & LaLung-Bonnaire, 1912
           2 Genus Naegleria Aléxéieff, 1912
           3 Genus Psalteriomonas Broers, Stumm, Vogels & Brugerolle, 1990
           4 "lyromonads" see Order Lyromonadida Cavalier-Smith, 1993
           5 Genus Percolomonas T. Fenchel & D.J. Patterson, 1986
           6 Heterolobosea Page & Blanton, 1985