Phylum Cyanobacteria (ex Stanier 1974) Cavalier-Smith 2002 stat. inval. - cyanobacteria see Phylum Cyanobacteriota Oren et al. 2022 Subgroup Rivularean Genus Calothrix C.Agardh ex Bornet & Flahault (1886) see Genus Calothrix Agardh ex Bornet and Flahault 1886