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?]
           Order Stylonematales K.M.Drew (1956)
             .1 Genus Bangiopsis Schmitz, in Engl. & Prantl (1896)
             .2 Genus Chroodactylon Hansgirg (1885)
             .3 Genus Chroothece Hansgirg, in Wittrock & Nordst. (1884)
             .4 Genus Goniotrichiopsis
             .5 Genus Rhodosorus Geitler (1930)
             .6 Genus Stylonema Reinsch (1874)
             1 Family Stylonemataceae K.M.Drew