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
         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)