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)
           Subclass Rhodymeniophycidae G.W.Saunders & Hommers. (2004)
             Order Gigartinales F.Schmitz
               Family Nizymeniaceae Womersley (1971)