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 Family Chamaesiphonaceae Borzì (1878) see Family Chamaesiphonaceae Borzì 1878 ?Genus Clastidium O. Kirchner (1880) see Genus Clastidium Kirchner 1880