Procaryotic Genera
   Domain "Bacteria" Woese et al. 1990
     Phylum Cyanobacteria (ex Stanier 1974) Cavalier-Smith 2002 [monotypic] - cyanobacteria
       Class "Cyanobacteria" Cavalier-Smith, 2002
         Subsection IV
           Family II see Family Family 4.2 nom. inval.
             Form genus Calothrix C.Agardh ex É. Bornet & C. Flahault 1886 [ICBN]