Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         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
                             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 Eucyrtidioidea Ehrenberg, 1847
                                             Family †Xitidae Pessagno, 1977
                                               1 Genus †Clavaxitus Dumitrica, 1997
                                               2 Genus †Crolanium Pessagno, 1977
                                               3 Genus †Foremanina Empson-Morin, 1981
                                               4 Genus †Neorelumbra Kiessling, 1995
                                               5 Genus †Novixitus Pessagno, 1977
                                               6 Genus †Praexitus Dumitrica, 1997
                                               7 Genus †Pseudoxitus Wu & Pessagno, 1993
                                               8 Genus †Tugurium O'Dogherty, 1994, nom. illeg.
                                               9 Genus †Xitusᵀ Pessagno, 1977