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 Nostocales Borzì (1914) see Order Nostocales corrig. Borzì 1914 Family Scytonemataceae A.B.Frank (1886) see Family Scytonemataceae corrig. Frank 1886 ?Genus Ophiothrix Sant'Anna, Azevedo, Kaštovský & Komárek (2010), nom. illeg. see Genus Cyanophiothrix E.A. Molinari-Novoa & M.D. Guiry (2021)