Phylum Cyanobacteria (ex Stanier 1974) Cavalier-Smith 2002 - cyanobacteria
   1 Subgroup Chroococcacean
   2 Subgroup Pleurocapsalean
   3 Subgroup Oscillatorian
   4 Subgroup Nostocacean
   5 Subgroup Rivularean
   6 Subgroup Stigonematalean
   7 Genus Aphanocapsa Nägeli (1849), incertae sedis
   8 Genus Cylindrospermum F.T. Kützing 1843 ex É. Bornet & C. Flahault 1886-1888[1888] [ICBN], incertae sedis