organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Eukaryota Chatton, 1925 - eukaryotes
     Algae
       Phylum Heterokontophyta Moestrup (1992) - heterokonts see Phylum Ochrophyta Caval.-Sm. (1995)
         a Class Bacillariophyceae Haeckel (1878) - pennates
         b Class Dictyochophyceae Silva (1980)
         c Class Xanthophyceae P. Allorge ex Fritsch (1935) - yellow-green algae
         d Class Phaeophyceae Hansgirg (1886) - brown algae