Phylum Cyanobacteria (ex Stanier 1974) Cavalier-Smith 2002 stat. inval. - cyanobacteria see Phylum Cyanobacteriota Oren et al. 2022 Subgroup Chroococcacean Genus Chamaesiphon A.Braun (1864) see Genus Chamaesiphon Braun 1864