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.
       1 Family Synechococcaceae Komárek & Anagn. (1995) [monotypic] see Family Synechococcaceae Komárek and Anagnostidis 1995
       2 Family Prochlorococcaceae Komárek & Strunecký (2020) see Family Prochlorococcaceae Komárek and Strunecký 2020