Procaryotic Genera
   Domain "Bacteria" Woese et al. 1990
     Phylum Cyanobacteria (ex Stanier 1974) Cavalier-Smith 2002 [monotypic] - cyanobacteria
       Class "Cyanobacteria" Cavalier-Smith, 2002
         Subsection III [monotypic] see Family Family 3.1 nom. inval.
           Family I see Family Family 3.1 nom. inval.
             Form genus Spirulina P.J.F. Turpin ex M. Gomont (1892)