, Sceptroneis C. G. Ehrenberg 1844 , Schroederella J. Pavillard 1913 , Scolioneidaceae Mann 1990 , Scolioneis D.G. Mann in Round at alii 1990 , Scoliopleura , Scoliopleura Grunow 1860 , Scoliotropidaceae Mereschkowsky 1903 , Scoliotropis Cleve 1894 , Sellaphora 11 , Sellaphora Mereschowsky 1902 , Sellaphoraceae Mereschkowsky 1902 , Sellaphorineae Mann 1990 , Seminavis D.G. Mann in F.E. Round, R.M. Crawford & D.G. Mann 1990 , Semiorbis R.M. Patrick in R.M. Patrick & Reimer, 1966 , Seshukovia S.I. Gleser, 1975 , Sheshukovia S. I. Gleser 1975 , Simonsenia 1 , Simonsenia H. Lange-Bertalot 1979 , Skeletonema , Skeletonema R.K. Greville 1865 , Skeletonemataceae Lebour, 1930 , Sphynctolethus Hanna 1927 , Stauroforma 1 , Stauroforma R. Flower, V. Jones & F.E. Round , Stauroneidaceae Mann 1990 , Stauroneis 45 , Stauroneis Ehrenberg 1843 , Staurophora 5 , Staurophora Mereschkowsky, 1903 , Stauropsis Meunier 1907 , Stauroptera Ehrenberg , Staurosira 3 , Staurosira C. G. Ehrenberg 1843 , Staurosirella 5 , Staurosirella D.M. Wiliams & F.E. Round 1988 , Staurotropis Paddock, 1988 , Stellarima Hasle & P.A. Sims 1986 , Stenoneis T.P. Cleve 1894 , Stenopterobia , Stenopterobia Brébisson ex Van Heurck 1896 , Stephanocostis S.I. Genkal & A.E. Kuzmina 1985 , Stephanocyclus , Stephanocyclus Skabitschevsky , Stephanodiscaceae Glezer & Makarova 1986 , Stephanodiscus 4 , Stephanodiscus C.G. Ehrenberg 1845 , Stephanopyxidaceae Nikolaev in Round et alli 1990 , Stictocyclaceae F.E. Rounf, 1978 , Stictocyclales F.E. Round in F.E. Round, R.M. Crawford & D.G. Mann, 1990 , Stictocyclus A. Mann 1925 , Stictodiscaceae (Schütt) Simonsen 1972 , Stictodiscales Round & Crawford 1990 , Stictodiscus Greville 1861 , Stilus Paddock, 1988 , Stoschiella L. Guillou & M.-J. Chrétiennot-Dinet in L. Guillou et al., 1999 , Strangulonema R.K. Greville 1865 , Strelnikovia R. Ross & P.A. Sims 1985 , Streptotheca Shrubsole 1870 , Streptothecaceae Crawford 1990 , Striatella C.A. Agardh, 1832 , Striatellaceae Kützing 1844 , Striatellales Round 1990 , Subsilicea H.A. von Stosch & B.E.F. Reimann 1970 , Surirella 11 , Surirella Turpin 1828 , Surirellaceae Kützing 1844 , Surirellales Mann 1990 , Symbolophora C. G. Ehrenberg 1844 , Syndetocystis Ralfs ex Greville 1866 , Synedra 3 , Synedra Ehrenberg 1830 , Synedropsis Hassle, Medlin et Syvertsen 1998 , Synedrosphenia (H. Peragallo) Azpeitia Moros, 1911