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 Nostocaceae Eichler (1886) see Family Nostocaceae Eichler 1886
         Genus Raphidiopsis F.E. Fritsch & F. Rich (1929) see Genus Raphidiopsis Fritsch and Rich 1929