procaryotes
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum Cyanobacteria "Stanier (1974)" [monotypic] see Phylum Cyanobacteriota Oren et al. 2022
       Class "Cyanobacteria" "Stanier (1974)", nom. inval. [monotypic] - cyanoprokaryotes see Class Cyanophyceae Hauck (1885)
         Subsection IV
           Subgroup II see Family II
             1 Form genus Calothrix C.Agardh ex Bornet & Flahault (1886) see Genus Calothrix Agardh ex Bornet and Flahault 1886
             2 Form genus Rivularia C.Agardh ex Bornet & Flahault (1886), nom. cons. see Genus Rivularia Agardh ex Bornet and Flahault 1886 nom. cons.
             3 Form genus Tolypothrix Kütz. ex Bornet & Flahault (1886) see Genus Tolypothrix Kützing ex Bornet and Flahault 1886