Domain Bacteria Woese et al. 1990
   Phylum Cyanobacteria (ex Stanier 1974) Cavalier-Smith 2002 - cyanobacteria
     Class "Cyanobacteria" Cavalier-Smith, 2002
       Subsection IV
         Subgroup I see Family I
           Form genus Cylindrospermum F.T. Kützing 1843 ex É. Bornet & C. Flahault 1886-1888[1888] [ICBN]