life see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Empire Eukaryota (Chatton, 1925) see Domain Eukaryota Chatton, 1925
     Kingdom Plantae Haeckel (1866) - plants
       Subkingdom Biliphyta Caval.-Sm. (1981) [paraphyletic?] - red algae and glaucophytes see Kingdom Plantae Haeckel (1866)
         Infrakingdom Rhodophyta Wettst. (1901) [monotypic] see Phylum Rhodophyta Wettst. (1901)
           Phylum Rhodophyta Wettst. (1901) - red algae
             Subphylum Rhodellophytina Caval.-Sm. (1998) [monotypic]
               Class Rhodellophyceae Caval.-Sm. (1998) [paraphyletic?]
                 1 Porphyridiales Kylin ex Skuja (1939)
                 2 Cyanidiales T.A.Chr. (1962), nom. inval. see Order Cyanidiales Doweld (2001)
                 3 Compsopogonales Skuja (1939)
                 4 Genus Porphyridium Nägeli (1849), nom. cons.
                 5 Genus Stylonema Reinsch (1874)