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 Chroococcales Ardissone (1887) see Order Chroococcales corrig. Ardissone 1887
       Family Geminocystaceae Tuji, Yamaguchi & Niiyama (2021) see Family Geminocystaceae Tuji et al. 2021
         1 Genus Annamia Nguyen (2013) see Genus Annamia Nguyen 2013
         2 Genus Cyanobacterium Rippka & Cohen-Baz. (2022) see Genus Cyanobacterium Rippka and Cohen-Bazire 2022
         3 Genus Geminobacterium Ramos, Brito & Kaštovský (2017) see Genus Geminobacterium Ramos et al. 2017
         4 Genus Geminocystis Korelusová, Kaštovský & Komárek (2009) see Genus Geminocystis Korelusová et al. 2009
         5 ?Genus Microcrocis P.G. Richter (1892) see Genus Microcrocis Richter 1892
         6 Genus Picosynechococcus Komárek, J.R.Johans. & Strunecký (2020) see Genus Picosynechococcus Komárek et al. 2020