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)
           Order Compsopogonales Skuja (1939)
             1 Family Boldiaceae Herndon (1964)
             2 Family Compsopogonaceae F.Schmitz (1896)