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 Synechococcaceae Komárek & Anagn. (1995) see Family Synechococcaceae Komárek and Anagnostidis 1995
         01 Form genus "Aphanothece" C. Nägeli (1849), nom. cons. see Genus Aphanothece Nägeli 1849 nom. cons.
         02 Form genus Bacularia Borzì (1905) see Genus Bacularia Borzì 1905
         03 Form genus Cyanocatena F. Hindák (1975) see Genus Cyanocatena Hindák 1975
         04 Genus Cyanobium Rippka & Cohen-Baz. (1983), nom. inval. see Genus Cyanobium Rippka and Cohen-Bazire 1983 nom. inval.
         05 Form genus Cyanodictyon A. Pascher (1914) see Genus Cyanodictyon Pascher 1914
         06 Form genus Cyanogranis F. Hindák (1982) see Genus Cyanogranis Hindák 1982
         07 Form genus Cyanonephron B. Hickel (1985) see Genus Cyanonephron Hickel 1985
         08 Form genus Cyanothamnos Cronberg (1991) see Genus Cyanothamnos Cronberg 1991
         09 Form genus Epigloeosphaera Komárková-Legnerová (1991) see Genus Epigloeosphaera Komárková-Legnerová 1991
         10 Form genus Lemmermanniella L. Geitler (1942) see Genus Lemmermanniella Geitler 1942
         11 Form genus Pannus B. Hickel (1991) see Genus Pannus Hickel 1991
         12 Genus Prochlorococcus Chisholm, Frankel, Goericke, Olson, Palenik, Waterbury, West-Johnsrud & Zettler (1992), nom. inval. see Genus Prochlorococcus Chisholm, Frankel, Goericke, Olson, Palenik, Waterbury, West–Johnsrud & Zettler (2020)
         13 Genus Rhabdoderma W. Schmidle & R. Lauterborn (1900) see Genus Rhabdoderma Schmidle and Lauterborn 1900
         14 Form genus Rhabdogloea B. Schröder (1917) see Genus Rhabdogloea Schröder 1917
         15 Form genus Rhodostichus L. Geitler & A. Pascher (1931) see Genus Rhodostichus Geitler and Pascher 1931
         16 Genus Synechococcus C. Nägeli (1849) see Genus Synechococcus Nägeli 1849
         17 Genus "Thermosynechococcus" Katoh et al. (2001), nom. nud. see Genus Thermosynechococcus Katoh, Itoh, Shen & Ikeuchi (2020)
         18 Form genus Tubiella M.M. Hollerbach (1935) see Genus Tubiella Hollerbach 1935
         19 Form genus Wolskyella G. Claus (1963) see Genus Wolskyella Claus 1963