Phylum Cyanobacteria Garcia-Pichel et al. (2020) see Phylum Cyanobacteriota Oren et al. 2022
   Class Cyanophyceae Hauck (1885) see Class Chroococcophyceae Hollerbach et al. 1953
     Order Synechococcales Hoffmann, Komárek & Kaštovský (2005), nom. inval. see Order Synechococcales Hoffmann et al. 2005 nom. nud.
       Family Prochlorococcaceae Komárek & Strunecký (2020) see Family Prochlorococcaceae Komárek and Strunecký 2020
         1 Genus Anathece (Cronberg & Komárek) Komárek, Kaštovský & Jezberová (2011) see Genus Anathece (Cronberg and Komárek 1994) Komárek et al. 2011
         2 Genus Cyanobium Rippka & Cohen-Baz. (1983), nom. inval. see Genus Cyanobium Rippka and Cohen-Bazire 1983 nom. inval.
         3 Genus Parasynechococcus Coutinho, Tschoeke, Thompson & Thompson (2020) see Genus Parasynechococcus Coutinho et al. 2020
         4 Genus Prochlorococcus Chisholm, Frankel, Goericke, Olson, Palenik, Waterbury, West–Johnsrud & Zettler (2020) see Genus Prochlorococcus Chisholm et al. 2020