Abas R. Ross & P.A. Sims, 1980 † (basis of record)
Abas R. Ross & P.A. Sims, 1980 † (extant flag source)
Acanthoceros accepted as Acanthoceras H. Honigmann, 1909 (basis of record)
Acanthoceros accepted as Acanthoceras H. Honigmann, 1909 (extant flag source)
Achnanthes Bory de Saint-Vincent, 1822 (basis of record)
Achnanthidium Kützing, 1844 (extant flag source)
Achnanthidium Kützing, 1844 (basis of record)
Actinella F.W. Lewis, 1864 (extant flag source)
Actinella F.W. Lewis, 1864 (basis of record)
Actinocyclus Ehrenberg, 1837 (basis of record)
Actinocyclus Ehrenberg, 1837 (extant flag source)
Actinoptychus Ehrenberg, 1843 (basis of record)
Ailuretta P.A. Sims, 1986 † (extant flag source)
Ailuretta P.A. Sims, 1986 † (basis of record)
Amphipleura Kützing, 1844 (extant flag source)
Amphipleura Kützing, 1844 (basis of record)
Amphitetras Ehrenberg, 1840 (basis of record)
Amphitetras Ehrenberg, 1840 (extant flag source)
Amphora Ehrenberg ex Kützing, 1844 (basis of record)
Amphora Ehrenberg ex Kützing, 1844 (extant flag source)
Anaulus Ehrenberg, 1844 (basis of record)
Aneumastus D.G. Mann & A.J. Stickle in F.E. Round, R.M. Crawford & D.G. Mann, 1990 (basis of record)
Aneumastus D.G. Mann & A.J. Stickle in F.E. Round, R.M. Crawford & D.G. Mann, 1990 (extant flag source)
Anomoeoneis E. Pfitzer, 1871 (extant flag source)
Anomoeoneis E. Pfitzer, 1871 (basis of record)
Anorthoneis Grunow, 1868 (extant flag source)
Anorthoneis Grunow, 1868 (basis of record)
Arachnoidiscus H. Deane ex G. Shadbolt, 1852 (basis of record)
Arcocellulus G.R. Hasle, H.A. von Stosch & E.E. Syvertsen, 1983 (extant flag source)
Arcocellulus G.R. Hasle, H.A. von Stosch & E.E. Syvertsen, 1983 (basis of record)
Ardissonea De Notaris, 1870 (basis of record)
Ardissonea De Notaris, 1870 (extant flag source)
Asterionella Hassall, 1850 (extant flag source)
Asterionella Hassall, 1850 (basis of record)
Asterionellopsis F.E. Round in F.E. Round, R.M. Crawford & D.G. Mann, 1990 (extant flag source)
Asterionellopsis F.E. Round in F.E. Round, R.M. Crawford & D.G. Mann, 1990 (basis of record)
Asterolampra Ehrenberg, 1844 (basis of record)
Asterolampra Ehrenberg, 1844 (extant flag source)
Asteromphalus Ehrenberg, 1844 (basis of record)
Attheya T. West, 1860 (extant flag source)
Attheya T. West, 1860 (basis of record)
Aulacodiscus C.G. Ehrenberg, 1844 (basis of record)
Aulacoseira Thwaites, 1848 (extant flag source)
Aulacoseira Thwaites, 1848 (basis of record)
Auliscus Ehrenberg, 1843 (basis of record)
Auricula Castracane, 1873 (extant flag source)
Auricula Castracane, 1873 (basis of record)
Azpeitia M. Peragallo in Tempère & H. Peragallo, 1912 (basis of record)
Azpeitia M. Peragallo in Tempère & H. Peragallo, 1912 (extant flag source)
Bacillaria J.F. Gmelin, 1791 (basis of record)
Bacillaria J.F. Gmelin, 1791 (extant flag source)
Bacteriastrum Shadbolt, 1854 (basis of record)
Bacteriastrum Shadbolt, 1854 (extant flag source)
Bacteriosira H.H. Gran, 1900 accepted as Bacterosira Gran, 1900 (basis of record)
Bacteriosira H.H. Gran, 1900 accepted as Bacterosira Gran, 1900 (extant flag source)
Baxteriopsis G. Karsten in Engler & Prantl, 1928 † (basis of record)
Baxteriopsis G. Karsten in Engler & Prantl, 1928 † (extant flag source)
Bellerochea Van Heurck, 1885 (extant flag source)
Bellerochea Van Heurck, 1885 (basis of record)
Bennettella R.W. Holmes, 1985 (extant flag source)
Bennettella R.W. Holmes, 1985 (basis of record)
Berkeleya Greville, 1827 (extant flag source)
Berkeleya Greville, 1827 (basis of record)
Biddulphia S.F. Gray, 1821 (basis of record)
Biddulphiopsis von Stosch & R.Simonsen, 1984 (extant flag source)
Biddulphiopsis von Stosch & R.Simonsen, 1984 (basis of record)
Biremis D.G. Mann & E.J. Cox in F.E. Round, R.M. Crawford & D.G. Mann, 1990 (basis of record)
Biremis D.G. Mann & E.J. Cox in F.E. Round, R.M. Crawford & D.G. Mann, 1990 (extant flag source)
Bleakeleya F.E. Round in F.E. Round, R.M. Crawford & D.G. Mann, 1990 (basis of record)
Bleakeleya F.E. Round in F.E. Round, R.M. Crawford & D.G. Mann, 1990 (extant flag source)
Brachysira Kützing, 1836 (basis of record)
Brachysira Kützing, 1836 (extant flag source)
Brebissonia Grunow, 1860 (basis of record)
Brebissonia Grunow, 1860 (extant flag source)
Briggera R. Ross & P.A. Sims, 1985 † (extant flag source)
Briggera R. Ross & P.A. Sims, 1985 † (basis of record)
Brightwellia Ralfs in Pritchard, 1861 † (extant flag source)
Brightwellia Ralfs in Pritchard, 1861 † (basis of record)
Brockmanniella Hasle, Stosch & Syvertsen, 1983 (basis of record)
Brockmanniella Hasle, Stosch & Syvertsen, 1983 (extant flag source)
Campylodiscus Ehrenberg ex Kützing, 1844 (extant flag source)
Campylodiscus Ehrenberg ex Kützing, 1844 (basis of record)
Campyloneis Grunow, 1862 (extant flag source)
Campyloneis Grunow, 1862 (basis of record)
Campylopyxis L.K. Medlin, 1985 (extant flag source)
Campylopyxis L.K. Medlin, 1985 (basis of record)
Campylosira Grunow ex Van Heurck, 1885 (extant flag source)
Campylosira Grunow ex Van Heurck, 1885 (basis of record)
Caponea A.C. Podzorski, 1984 (extant flag source)
Caponea A.C. Podzorski, 1984 (basis of record)
Catacombas D.M. Williams & F.E. Round, 1986 (basis of record)
Catacombas D.M. Williams & F.E. Round, 1986 (extant flag source)
Catenula Mereschkowsky, 1903 (extant flag source)
Catenula Mereschkowsky, 1903 (basis of record)
Cavinula D.G. Mann & A.J. Stickle in F.E. Round, R.M. Crawford & D.G. Mann, 1990 (basis of record)
Cavinula D.G. Mann & A.J. Stickle in F.E. Round, R.M. Crawford & D.G. Mann, 1990 (extant flag source)
Centronella M. Voigt, 1902 (extant flag source)
Centronella M. Voigt, 1902 (basis of record)
Cerataulina H. Peragallo ex F. Schütt in Engler & Prantl, 1896 (basis of record)
Cerataulina H. Peragallo ex F. Schütt in Engler & Prantl, 1896 (extant flag source)