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 Gomontiellales Strunecký & Mareš (2023) see Order Gomontiellales Strunecký and Mareš 2023
       1 Family Konicacronemataceae Strunecký & Mareš (2023) [monotypic] see Family Konicacronemataceae Strunecký and Mareš 2023
       2.1 Family Cyanothecaceae Komárek, J. Kaštovský, J. Mareš & J.R.Johans. (2014) [monotypic] see Family Cyanothecaceae Komárek et al. 2014
       2.2.1 Family Chamaesiphonaceae Borzì (1878) see Family Chamaesiphonaceae Borzì 1878
       2.2.2 Family Gomontiellaceae Elenkin ex Geitler (1942) see Family Gomontiellaceae Elenkin ex Geitler 1942