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 Hacrobia Okamoto, Chantangsi, Horák, Leander & Keeling, 2009
                             Phylum Haptista Cavalier-Smith, 2003
                               Subphylum Heliozoa Haeckel (1866) [monotypic]
                                 Class Centroheleaᵀ Kühn, 1926 [monotypic]
                                   Order Centrohelidaᵀ Kühn, 1926
                                     Suborder Pterocystina Cavalier-Smith & von der Heyden, 2007
                                       Family Choanocystidae Cavalier-Smith & von der Heyden, 2007
                                         Genus Choanocystisᵀ Penard, 1904