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 Haptophytinaᵀ Caval.-Sm. (2015)
                                 Class Coccolithophyceae Rothm. (1951)
                                   "Heterococcoliths"
                                     "Placoliths"
                                       Order †Podorhabdales Rood et al. (1971)
                                         1 Family †Axopodorhabdaceaeᵀ (Bown & Young, 1997)
                                         2 Family †Biscutaceae Black (1971)
                                         3 Family †Calyculaceae Noel (1973)
                                         4 Family †Prediscosphaeraceae Rood, Hay & Barnard (1971)
                                         5 ?Family †Cretarhabdaceae Thierstein (1973)
                                         6 ?Family †Mazaganellaceae Bown (1987)
                                         7 ?Family †Tubodiscaceae (Bown & Rufledge, 1997)