Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         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 Plantae Haeckel (1866) - plants
                           Clade Rhodaria Cavalier-Smith 2021
                             Subkingdom Rhodoplantae G.W.Saunders & Hommers. (2004) [monotypic]
                               Phylum Rhodophyta Wettst. (1901) - red algae
                                 Subphylum Rhodellophytina Caval.-Sm. (1998), sedis mutabilis
                                   Class Porphyridiophyceae Kylin, sedis mutabilis [monotypic]
                                     Order Porphyridialesᵀ Kylin ex Skuja (1939)
                                       Family Porphyridiaceaeᵀ Skuja
                                         Genus Porphyridiumᵀ Nägeli (1849), nom. cons.
                                           Porphyridium aerugineum Geitler
                                           Porphyridium cruentum (Gray) Nägeli
                                           Porphyridium purpureum (Bory) K.M.Drew & R. Ross