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 Nassellaria Ehrenberg, 1847
                                         Order Cyrtidinata Haeckel, 1862
                                           Superfamily Acropyramidoidea Haeckel, 1881
                                             Family Sethophormididae Haeckel, 1881
                                               Subfamily Theopiliinae Haeckel, 1881
                                                 Genus Eucecryphalus Haeckel, 1860
                                                   1 Eucecryphalus cervus (Ehrenberg, 1872)
                                                   2 Eucecryphalus clinatus Takahashi, 1991
                                                   3 Eucecryphalus craspedota (Jørgensen, 1900)
                                                   4 †Eucecryphalus emmae (Haeckel, 1887)
                                                   5 Eucecryphalus europae (Haeckel, 1887)
                                                   6 Eucecryphalus gegenbauri Haeckel, 1860
                                                   7 †Eucecryphalus petrushevskaae Caulet, 1979
                                                   8 Eucecryphalus sestrodiscus (Haeckel, 1887)
                                                   9 Eucecryphalus tricostatus (Haeckel, 1887)