Kingdom Protozoa Goldfuss, 1818 - protozoa
Status: extant
   Subkingdom Corticata Lankester, 1878 see Subkingdom Biciliata
  Status: extant
     Infrakingdom Excavata T. Cavalier-Smith, 2002 see Supergroup Excavata Cavalier-Smith, 2002
    Status: extant
       Superphylum Discicristata Cavalier-Smith, 1998
      Status: extant
         Phylum Percolozoa Cavalier-Smith, 1992
        Status: extant
           Class Heterolobosea Page & Blanton, 1985
          Status: extant
             Order Schizopyrenida Singh, 1952
            Status: extant
               1 Genus Naegleria Aléxéieff, 1912
              Status: extant
               2 Genus Tetramitus Perty, 1852
              Status: extant
               3 Genus Vahlkampfia Chatton & LaLung-Bonnaire, 1912
              Status: extant