oxyphototroph prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Class Cyanoprokaryota Komárek & Golubić 1990 nom. nud. - cyanoprokaryotes
     Order Stigonematales Geitler (1925) see Order Nostocales Borzì (1914)
       Family Fischerellaceae Anagnostidis & Komárek (1990) see Family Hapalosiphonaceae Elenkin (1917), nom. cons.
         1 Form genus Doliocatella Geitler (1933) see Genus Doliocatella Geitler 1933
         2 Genus Fischerella (Bornet & Flahault) Gomont (1895) see Genus Fischerella (Bornet and Flahault 1886) Gomont 1895
         3 Form genus Fischerellopsis Fritsch (1932) see Genus Fischerella (Bornet and Flahault 1886) Gomont 1895
         4 Form genus Leptopogon Borzì (1907) see Genus Leptopogon Borzì 1907
         5 Form genus Parthasarathiella N. Suba Raju (1962) see Genus Parthasarathiella Suba Raju 1962
         6 Form genus Westiellopsis Janet (1941) see Genus Westiellopsis Janet 1941