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) Genus Cyanidium L. Geitler (1933)