Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Clade neomura Cavalier-Smith, 1987
             Domain Eukaryota Chatton, 1925 - eukaryotes
               Clade discaria Cavalier-Smith, 2021
                 Clade natates Cavalier-Smith, 2021
                   Clade photaria Cavalier-Smith, 2021
                     Clade eucorta Cavalier-Smith, 2021
                       Superkingdom Corticata Lankester, 1878 - corticates
                         Kingdom Chromista Caval.-Sm. (1981) - chromists
                           Subkingdom Harosa Cavalier-Smith, 2010
                             [crown] Clade Sar Adl et al. 2012 [Simpson & Dunthorn 2020]
                               Infrakingdom Rhizaria Cavalier-Smith, 2002
                                 Phylum Cercozoa Cavalier-Smith, 1998
                                   Subphylum Monadofilosaᵀ Cavalier-Smith, 1997
                                     Class Sarcomonadea Cavalier-Smith, 1993
                                       Order Sainouroida
                                         Family Helkesimastigidae Cavalier-Smith, 2009 [monotypic]
                                           Genus Helkesimastixᵀ Woodcock & Lapage, 1914
                                             1 Helkesimastix faecicolaᵀ Woodcock & Lapage, 1914
                                             2 Helkesimastix major
                                             3 Helkesimastix marina T. Cavalier-Smith et al., 2009