Domain Bacteria Woese et al. 1990
   Phylum Cyanobacteria (ex Stanier 1974) Cavalier-Smith 2002 - cyanobacteria
     Class "Cyanobacteria" Cavalier-Smith, 2002
       1 Subsection I see Family Family 1.1 nom. inval.
       2 Subsection II
       3 Subsection III see Family Family 3.1 nom. inval.
       4 Subsection IV
       5 Subsection V