Class Cyanoprokaryota Komárek & Golubić 1990 nom. nud. - cyanoprokaryotes
   Subclass Nostocophycidae Hoffmann, Komárek & Kaštovský (2005), nom. inval. [monotypic]
     Order Nostocales Borzì (1914) see Order Nostocales corrig. Borzì 1914
       Family Microchaetaceae Lemmermann (1907) see Family Rivulariaceae Frank (1886)
         1 Form genus Camptylonemopsis Desikachary (1948) see Genus Camptylonemopsis Desikachary 1948
         2 Form genus Coleodesmiopsis Dutt, Datta & Gupta (1983) see Genus Coleodesmiopsis corrig. Dutt et al. 1983
         3 Genus Coleodesmium A. Borzì ex L. Geitler (1942) see Genus Coleodesmium Borzì ex Geitler 1942
         4 Form genus Fortiea G. De Toni (1936) see Genus Fortiea De Toni 1936
         5 Form genus Hassallia M.J. Berkeley ex Bornet & Flahault (1886), nom. illeg. see Genus Tolypothrix Kützing ex Bornet and Flahault 1886
         6 Genus Microchaete G. Thuret ex Bornet & Flahault (1886), nom. cons. see Genus Microchaete Thuret ex Bornet and Flahault 1886 nom. cons.
         7 Genus Petalonema Berkeley ex Correns (1889) see Genus Petalonema Berkeley ex Correns 1889
         8 Genus Spirirestis Flechtner & J.R.Johans. (2002) see Genus Spirirestis Flechtner and Johansen 2002
         9 Genus Tolypothrix Kütz. ex Bornet & Flahault (1886) see Genus Tolypothrix Kützing ex Bornet and Flahault 1886