Kingdom Plantae Haeckel (1866) - plants
   Subkingdom Rhodoplantae G.W.Saunders & Hommers. (2004)
     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)
           2.1 Order Erythropeltidales Garbary, Hansen & Scagel (1980) [monotypic]
           2.2 Order Rhodochaetales Bessey (1907) [monotypic]