eukaryotes see Domain Eukaryota Chatton, 1925
   Kingdom Protozoa Goldfuss, 1818 [paraphyletic] - protozoa
     Subkingdom Sarcomastigota Cavalier-Smith, 1983 [paraphyletic] see [unranked] dorsates Cavalier-Smith, 2021
       Infrakingdom Sulcozoa Cavalier-Smith, 2012 [monotypic] see [unranked] dorsates Cavalier-Smith, 2021
         Phylum Sulcozoa Cavalier-Smith, 2012 [paraphyletic] see [unranked] dorsates Cavalier-Smith, 2021
           Subphylum Varisulca Cavalier-Smith, 2012 [sister group to excluded taxa] see [unranked] Varisulca Cavalier-Smith, 2012
             Class Hilomonadea Cavalier-Smith, 2008 [monotypic]
               Order Rigifilida Cavalier-Smith, 2012
                 Genus Rigifila Yabuki & Cavalier-Smith, 2012