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 Acaryochloridales Strunecký & Mareš (2023), nom. inval. see Order Acaryochloridales Strunecký and Mareš 2023 nom. inval.
       Family Thermosynechococcaceae Komárek, Strunecký & J.R.Johans. (2020) [monotypic] see Family Thermosynechococcaceae Komárek et al. 2020
         1 Genus Thermosynechococcus Katoh, Itoh, Shen & Ikeuchi (2020) see Genus Thermosynechococcus Katoh et al. 2020