Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Biota
           "neomura"
             Domain Eukaryota Chatton, 1925 - eukaryotes
               neokaryotes Cavalier-Smith 1993 - mitochondrial eukaryotes
                 neozoa Cavalier-Smith 1993
                   Superkingdom Corticata Lankester, 1878
                     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)
                               Genus †Annulithus A.P. Rood et al., in T. Barnard & W.W. Hay (1974)
                               Genus †Chiasmolithus
                               Genus †Corolithion
                               Genus Cyclococcolithus
                               Genus †Dictyococcites
                               Genus Discosphaera Haeckel (1894)
                               Genus †Isthmolithus G. Deflandre (1954)
                               Genus †Nannoconus Kamptner (1931)
                               1.1 [Order] Prymnesiales Papenfuss (1955) [monotypic]
                               1.2 Order Phaeocystales Medlin (2000) [monotypic]
                               2 "Nannoliths"
                               3.1 "Holococcoliths"
                               3.2.1 "Heterococcoliths"
                               3.2.2 [Order] Isochrysidales Pascher (1910)
                               4 [Order] Coccolithales Schwarz (1932)