Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Rhodymeniobiota Starobogatov ex Doweld (2001)
       Subkingdom Rhodymeniobiotina Doweld (2001)
         Phylum Cyanidiophyta Moehn ex Doweld (2001) [monotypic] see Subphylum Cyanidiophytina
           Class Cyanidiophyceae Merola (1982)
             Order Cyanidiales Doweld (2001)
               Family Cyanidiaceae Geitler (1933)
                 1 Genus Cyanidium L. Geitler (1933)