, Caloneis 4 , Caloneis P.T. Cleve 1894 , Calyptrella U. Hernández-Becerril & M.E. Meave del Castillo, 1996 , Campylodiscus 1 , Campylodiscus C.G. Ehrenberg ex F.T. Kützing 1844 , Campyloneis A. Grunow 1862 , Campylopyxis L.K. Medlin 1985 , Campylosira A. Grunow ex H. Van Heurck 1885 , Capartogramma 1 , Capartogramma Kufferath, 1956 , Caponea A.C. Podzorski 1984 , Carteriportula Flower & Håkansson, 1994 , Catacombas D.M. Williams & F.E. Round, 1986 , Catenula C. Mereschkowsky 1902 [1903] , Catenulaceae Mereschkowsky 1902 , Cavinula 7 , Cavinula D.G. Mann & A.J. Stickle in F.E. Round, R.M. Crawford & D.G. Mann 1990 , Cavinulaceae Mann 1990 , Centronella Voigt 1902 , Cerataulina H. Peragallo ex F. Schutt in Engler & Prantl 1896 , Cerataulus C.G. Ehrenberg 1843 , Ceratoneis C.G. Ehrenberg 1839 , Chaetoceros , Chaetoceros C.G. Ehrenberg 1844 , Chaetocerotaceae Ralfs in Pritchard 1861 , Chaetocerotales Round & Crawford 1990 , Chaetocerotophycidae Round & Crawford 1990 , Chamaepinnularia 3 , Chamaepinnularia Lange-Bertalot & Krammer, 1996 , Chrysanthemodiscaceae Round 1978 , Chrysanthemodiscales Round 1978 , Chrysanthemodiscus A. Mann 1925 , Cistula P.T. Cleve 1894 , Climacodium A. Grunow 1868 , Climaconeis A. Grunow 1862 , Climacosphenia C.G. Ehrenberg 1843 , Climacospheniaceae Round 1990 , Climacospheniales Round 1990 , Cocconeidaceae Kützing 1844 , Cocconeis 5 , Cocconeis C.G. Ehrenberg 1837 , Cocconema C.G. Ehrenberg in Hemprich & C.G. Ehrenberg , Corethraceae Lebour 1930 , Corethrales Round & Crawford 1990 , Corethron A.F. Castracane 1886 , Corethrophycidae Round & Crawford 1990 , Coscinodiscaceae Kützing 1844 , Coscinodiscales Round & Crawford 1990 , Coscinodiscophyceae Round & Crawford, 1990 , Coscinodiscophycidae Round & Crawford 1990 , Coscinodiscus C.G. Ehrenberg 1839 , Coscinosira H.H. Gran 1900 , Cosmioneidaceae Mann 1990 , Cosmioneis 3 , Cosmioneis D.G. Mann & A.J. Stickle in F.E. Round, R.M. Crawford & D.G. Mann 1990 , Craspedodiscus C.G. Ehrenberg 1844 , Craspedostauros , Craspedostauros E.J. Cox, 1999 , Craticula 7 , Craticula A. Grunow 1867 , Ctenophora 1 , Ctenophora A. de Brebisson ex F.T. Kutzing 1849 , Cuneolus M.H. Giffen 1970 , Cyclophora A.F. Castracane 1878 , Cyclophoraceae Round & Crawford 1990 , Cyclophorales Round & Crawford 1990 , Cyclostephanos 1 , Cyclostephanos F.E. Round ex Theriot, Hakansson, Kociolek, Round & Stoermer 1987 , Cyclotella 4 , Cyclotella (F.T. Kutzing) A. de Brebisson 1838 , Cyclotubicoalitus Stoermer, Kociolek & Cody, 1990 , Cydostephanos Round , Cylindrospira Mitlehner, 1995 , Cylindrotheca , Cylindrotheca L. Rabenhorst 1859 , Cymatoneis P.T. Cleve 1894 , Cymatonitzschia R. Simonsen 1974 , Cymatopleura 2 , Cymatopleura W. Smith 1851 , Cymatosira A. Grunow 1862 , Cymatosiraceae Hasle, von Stosch & Syvertsen 1983 , Cymatosirales Round & Crawford 1990 , Cymatosirophycidae Round & Crawford 1990 , Cymbella 13 , Cymbella C.A. Agardh 1830 , Cymbellaceae Greville 1833 , Cymbellales Mann 1990 , Cymbellonitzschia 1 , Cymbellonitzschia F. Hustedt in A. Schmidt et al. 1924 , Cymbopleura 27