Domain Bacteria Woese et al. 1990 Phylum Cyanobacteria (ex Stanier 1974) Cavalier-Smith 2002 - cyanobacteria Class "Cyanobacteria" Cavalier-Smith, 2002 Subsection III see Family Family 3.1 nom. inval. Form genus Arthrospira E. Stizenberger ex Gomont 1892-1893[1893] [ICBN]