eukaryotes see Domain Eukaryota Chatton, 1925
   Kingdom Protozoa Goldfuss, 1818 [paraphyletic] - protozoa
     Subkingdom Eozoa Cavalier-Smith, 1997 [paraphyletic] see Infrakingdom Eozoa Cavalier-Smith, 1997
       Infrakingdom Excavata T. Cavalier-Smith, 2002 [paraphyletic] see Supergroup Excavata Cavalier-Smith, 2002
         Phylum Loukozoa Cavalier-Smith, 1999 [paraphyletic]
           Subphylum Metamonada Grassé, 1952 see Phylum Metamonada Grassé, 1952
             Infraphylum Trichozoa Cavalier-Smith, 1997 see Subphylum Trichozoa Cavalier-Smith, 1997
               Superclass Fornicata Simpson, 2003 see Infraphylum Fornicata Simpson, 2003
                 Class Eopharyngea Cavalier-Smith, 1993
                   Order Retortamonadida Grassé, 1952 [monotypic] - retortamonads
                     Family Retortamonadidae Wenrich, 1932 [monotypic]
                       Genus Retortamonas Grassi, 1879