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 Prochlorotrichales Strunecký & Mareš (2023) [monotypic] see Order Prochlorotrichales Strunecký and Mareš 2023 1 Family Prochlorotrichaceae Burger-Wiersma, Stal & Mur (1989) [monotypic] see Family Prochlorotrichaceae Burger-Wiersma et al. 1989