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 "Symphyonemataceae" Hoffmann, Komárek & Kaštovský (2005), nom. inval. see Family Scytonemataceae A.B.Frank (1886)
         01 Form genus Adrianema De Toni (1936), nom. illeg. see Genus Lithonema Ercegović 1929
         02 Form genus Brachytrichia G. Zanardini ex Bornet & Flahault (1886) see Genus Brachytrichia Zanardini ex Bornet and Flahault 1886
         03 Genus Herpyzonema Weber-van Bosse (1913) see Genus Herpyzonema Weber-van Bosse 1913
         04 Form genus Iyengariella Desikachary (1953) see Genus Iyengariella Desikachary 1953
         05 Genus Mastigocladopsis M.O.P. Iyengar & Desikachary (1946) see Genus Mastigocladopsis Iyengar and Desikachary 1946
         06 Form genus Parenchymorpha C.K. Tseng & M. Hua (1984) see Genus Parenchymorpha Tseng and Hua 1984
         07 Genus Symphyonemopsis G. Tiwari & A. Mitra (1969) see Genus Symphyonemopsis Tiwari and Mitra 1969
         08 Genus Symphyonema C.C. Jao (1944) see Genus Symphyonema Jao 1944
         09 Genus Umezakia M. Watanabe (1987) see Genus Umezakia Watanabe 1987
         10 Form genus Voukiella Ercegović (1925) see Genus Voukiella Ercegović 1925
         11 "Y-Stigonematales"