[living organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryota Whittaker & Margulis, 1978 see Domain Eukaryota Chatton, 1925
     Kingdom Plantae Haeckel (1866) - plants
       Subkingdom Biliphyta Caval.-Sm. (1981) - red algae and glaucophytes see Kingdom Plantae Haeckel (1866)
         Phylum Rhodophyta Wettst. (1901) - red algae
           Subphylum Metarhodophytina G.W.Saunders & Hommers. (2004) [monotypic]
             Class Compsopogonophyceae G.W.Saunders & Hommers. (2004)
               1 Order Compsopogonales Skuja (1939)
               2 Order Erythropeltidales Garbary, Hansen & Scagel (1980)
               3 Order Rhodochaetales Bessey (1907)