eukaryotes see Domain Eukaryota Chatton, 1925
   Kingdom Protozoa Goldfuss, 1818 [paraphyletic] - protozoa
     Subkingdom Natozoa Cavalier-Smith, 2021 [paraphyletic]
       Infrakingdom Eozoa Cavalier-Smith, 1997 see Clade Discoba Simpson 2009
         Superphylum Discicristata Cavalier-Smith, 1998
           Phylum Percolozoa Cavalier-Smith, 1992
             Subphylum Tetramitia Cavalier-Smith, 1993
               Infraphylum Eutetramitia Hanousková, Táborský & Čepička, 2018
                 Class Heterolobosea Page & Blanton, 1985
                   Order Schizophyenida Cavalier-Smith, 2021, orth. inval. see Order Schizopyrenida Singh, 1952
                     Family Naegleriidae Cavalier-Smith, 2021
                       Genus Naegleria Aléxéieff, 1912