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 Chroococcaceae Nägeli (1849) see Family Chroococcaceae Nägeli 1849
         01 Genus Chroococcus C. Nägeli (1849) see Genus Chroococcus Nägeli 1849
         02 Genus Cryptococcum Gama, Rigonato, Fiore & Sant'Anna (2019) see Genus Cryptococcum Gama et al. 2019
         03 ?Genus Cyanoarbor Wang (1989) see Genus Cyanoarbor Wang 1989
         04 ?Genus Cyanocatenula Joosten (2006) see Genus Cyanocatenula Joosten 2006
         05 ?Genus Cyanodermatium L. Geitler (1933) see Genus Cyanodermatium Geitler 1933
         06 ?Genus Cyanokybus J. Schiller (1956) see Genus Cyanokybus Schiller 1956
         07 ?Genus Cyanosarcina Kováčik (1988) see Genus Cyanosarcina Kováčik 1988
         08 ?Genus Entophysalis Kütz. (1843) see Genus Entophysalis Kützing 1843
         09 ?Genus Inacoccus Gama, Rigonato, Fiore & Sant'Anna (2019) see Genus Inacoccus corrig. Gama et al. 2019
         10 ?Genus Johanseninema P. Hašler, P. Dvořák & A. Poulíčková (2014) see Genus Johanseninema Hašler et al. 2014
         11 ?Genus Lithocapsa A. Ercegović (1925) see Genus Lithocapsa Ercegović 1925
         12 ?Genus Nephrococcus Y.Y. Li (1984) see Genus Nephrococcus Li 1984
         13 ?Genus Paracapsa E. Naumann (1924) see Genus Paracapsa Naumann 1924
         14 ?Genus Placoma P.K.A. Schousboe ex Bornet & G. Thuret (1876), nom. illeg. see Genus Cyanoplacoma E.A. Molinari-Novoa & M.D. Guiry (2021)
         15 ?Genus Pseudocapsa A. Ercegović (1925) see Genus Pseudocapsa Ercegović 1925
         16 ?Genus Siphononema L. Geitler (1925) see Genus Siphononema Geitler 1925