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 Spirulinales Komárek, J. Kaštovský, J. Mareš & J.R.Johans. (2014) see Order Spirulinales Komárek et al. 2014
       1 Family Spirulinaceae Hoffmann, Komárek & Kaštovský (2014) see Family Spirulinaceae (Gomont 1892) Hoffmann et al. 2014
       2 Family Lusitaniellaceae Strunecký & Mareš (2023) [monotypic] see Family Lusitaniellaceae Strunecký and Mareš 2023