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 Loriellaceae Geitler (1925) see Family Hapalosiphonaceae Elenkin 1917
         1 Form genus Colteronema Copel. (1936) see Genus Colteronema Copeland 1936
         2 Form genus Geitleria Friedmann (1955) see Genus Geitleria Friedmann 1955
         3 Form genus Hyphomorpha A. Borzì (1916) see Genus Hyphomorpha Borzì 1916
         4 Form genus Loriella A. Borzì (1892) see Genus Loriella Borzì 1892