Kingdom Plantae Haeckel (1866) - plants
   Subkingdom Rhodoplantae G.W.Saunders & Hommers. (2004)
     Phylum Rhodophyta Wettst. (1901) - red algae
       Subphylum Rhodellophytina Caval.-Sm. (1998) [monotypic]
         Class Rhodellophyceae Caval.-Sm. (1998) [paraphyletic?]
           1 Order "Porphyridiales 1" see Order Rhodellales H.S. Yoon, K.M. Müller, Sheath, F.D. Ott & D. Bhattacharya
           2 Order Stylonematales K.M.Drew (1956)
           3 Order Porphyridiales Kylin ex Skuja (1939)