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 Halvaria Cavalier-Smith, 2010
                                 Superphylum Heterokonta Caval.-Sm. (1986)
                                   Phylum Ochrophyta Caval.-Sm. (1995)
                                     Subphylum Phaeista Caval.-Sm. (1995)
                                       Infraphylum Marista Caval.-Sm. (2006)
                                         Superclass Fucistia Caval.-Sm. (1995)
                                           1 Class Chrysomerophyceae Caval.-Sm. (1995) [monotypic]
                                           1.0 [Class "Chrysomerophycea" Caval.-Sm. (1995)] see Class Chrysomerophyceae Caval.-Sm. (1995)
                                           2.1.1 Class Xanthophyceae P. Allorge ex Fritsch (1935) - yellow-green algae
                                           2.1.1.0 [Class Xanthophycea Fritsch (1935)] see Class Xanthophyceae P. Allorge ex Fritsch (1935)
                                           2.1.2 Class Phaeothamniophyceae R.A. Andersen & J.C. Bailey (1998)
                                           2.1.2.0 [Class Aurophyceae Caval.-Sm. (2013)] see Class Phaeothamniophyceae R.A. Andersen & J.C. Bailey (1998)
                                           2.2.1 Class Schizocladiophyceae Henry, Okuda & Kawai (2003) [monotypic]
                                           2.2.2 Class Phaeophyceae Hansgirg (1886) - brown algae
                                           2.2.2.0 [Class Phaeophycea Kjellman (1891)] see Class Phaeophyceae Hansgirg (1886)