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 neokaryotes Cavalier-Smith 1993 - mitochondrial eukaryotes
                 Clade neozoa Cavalier-Smith 1993
                   Superkingdom Corticata Lankester, 1878
                     Kingdom Chromista Caval.-Sm. (1981) - chromists
                       Subkingdom Harosa Cavalier-Smith, 2010
                         Infrakingdom Rhizaria Cavalier-Smith, 2002
                           Phylum Retaria Cavalier-Smith, 2002
                             Subphylum Radiozoa Cavalier-Smith, 1987
                               Superclass Polycystinia Ehrenberg, 1838
                                 Class Collodaria Haeckel, 1881 [monotypic]
                                   Order Collodaridaᵀ Haeckel, 1881
                                     Family Collophidiidae Biard & Suzuki, 2015 [monotypic]
                                       Genus Collophidiumᵀ Haeckel, 1887
                                         1 Collophidium ellipsoides
                                         2 Collophidium ovatum
                                         3 Collophidium serpentinumᵀ (Haeckel, 1887)