Kingdom Plantae Haeckel (1866) - plants
   Subkingdom Rhodoplantae G.W.Saunders & Hommers. (2004)
     Phylum Rhodophyta Wettst. (1901) - red algae
       Subphylum Eurhodophytina G.W.Saunders & Hommers. (2004)
         Class Florideophyceae Cronquist (1960)
           1 Subclass Hildenbrandiophycidae G.W.Saunders & Hommers. (2004) [monotypic]
           2.1 Subclass Nemaliophycidae Christensen (1978)
           2.2.1 Subclass Ahnfeltiophycidae G.W.Saunders & Hommers. (2004)
           2.2.2 Subclass Rhodymeniophycidae G.W.Saunders & Hommers. (2004)