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 Eolouka Cavalier-Smith, 2012 [paraphyletic]
             Class Tsukubea Cavalier-Smith, 2012 [monotypic] see Class Tsukubamonadea Cavalier-Smith, 2012
               Order Tsukubamonadida Yabuki et al., 2011 [monotypic]
                 Family Tsukubamonadidae Yabuki et al., 2011 [monotypic]
                   1 Genus Tsukubamonas Yabuki, Nakayama, Yubuki, Hashimoto, Ishida & Inagaki, 2011