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 Erythropeltidales Garbary, Hansen & Scagel (1980) [monotypic] Family Erythrotrichiaceae G.M. Sm. (1933)