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
         Phylum Eolouka Cavalier-Smith, 2012 [paraphyletic] see Clade Discoba Simpson 2009
           Class Tsukubamonadea Cavalier-Smith, 2012 [monotypic]
             Genus Tsukubamonas Yabuki, Nakayama, Yubuki, Hashimoto, Ishida & Inagaki, 2011