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 Rivulariaceae Frank (1886) see Family Rivulariaceae Frank 1886 Genus Calothrix C.Agardh ex Bornet & Flahault (1886) see Genus Calothrix Agardh ex Bornet and Flahault 1886