Class Cyanoprokaryota Komárek & Golubić 1990 nom. nud. - cyanoprokaryotes
   Subclass Synechococcophycidae Hoffmann, Komárek & Kaštovský (2005), nom. inval.
     Order "Synechococcales" Hoffmann, Komárek & Kaštovský (2005), nom. inval. see Order Synechococcales Hoffmann et al. 2005 nom. nud.
       Family Chamaesiphonaceae Borzì (1878) see Family Chamaesiphonaceae Borzì 1878
         1 Genus Chamaesiphon A.Braun (1864) see Genus Chamaesiphon Braun 1864
         2 Form genus Clastidium O. Kirchner (1880) see Genus Clastidium Kirchner 1880
         3 Form genus Cyanophanon L. Geitler (1955) see Genus Cyanophanon Geitler 1955
         4 Form genus Geitleribactron Komárek (1975) see Genus Geitleribactron Komárek 1975