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 Retaria Cavalier-Smith, 2002
                                   Subphylum Radiozoa Cavalier-Smith, 1987
                                     Superclass Polycystinia Ehrenberg, 1838
                                       Class Stauraxonaria Afanasieva & Amon, 2005
                                         Order †Palaeodiscata Afanasieva & Amon, 2005 [monotypic]
                                           Family †Palaeodiscidaeᵀ Afanasieva, 2000
                                             1 Genus †Copicyntroides Nazarov & Ormiston, 1985
                                             2 Genus †Eostylodictya Ormiston & Lane, 1976
                                             3 Genus †Gedauia Won, 1983
                                             4 Genus †Palaeodiscusᵀ Afanasieva, 2000, nom. illeg.
                                             5 Genus †Primaritripus Afanasieva, 2000
                                             6 Genus †Sphaerodiscus Won, 1983