Domain Bacteria Woese et al. 1990
   Phylum Cyanobacteria (ex Stanier 1974) Cavalier-Smith 2002 - cyanobacteria
     Class "Cyanobacteria" Cavalier-Smith, 2002
       Subsection V
         Family I
           Form genus Chlorogloeopsis A.K. Mitra & D.C. Pandey 1967 [ICBN]
           Form genus Fischerella (E. Bornet & C. Flahault) M. Gomont (1895)
           Form genus Geitleria Friedmann 1955 [ICBN]
           Form genus Iyengariella Desikachary 1953 [ICBN]
           Form genus Nostochopsis Wood ex Bornet & Flahault 1886 [ICBN]
           Form genus Stigonema C.Agardh ex Bornet & Flahault (1887)