Between brackets is the number of accepted species
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- Biota
- Kingdom Animalia
- Kingdom Archaea
- Kingdom Bacteria
- Kingdom Chromista
- Subkingdom Hacrobia
- Subkingdom Harosa
- Infrakingdom Halvaria
- Superphylum Alveolata
- Superphylum Heterokonta
- Phylum Bacillariophyta
- Class Bacillariophyceae
- Class Coscinodiscophyceae
- Class Mediophyceae
- Order Bacillariophyta (awaiting allocation)
- Family Disciferiaceae †
- Genus Acanthodiscus Pantocsek, 1892 †
- Genus Achnantheiopsis Lange-Bertalot, 1997
- Genus Achnanthepyla M. Peragallo, 1921
- Genus Actinoclava O. Müller, 1912 †
- Genus Actinodictyon Pantocsek, 1889 †
- Genus Actinogonium Ehrenberg, 1847 †
- Genus Actinogramma Ehrenberg, 1873
- Genus Amphitropis L. Rabenhorst, 1868
- Genus Anisodiscus Grunow ex Pantocsek, 1886
- Genus Annellus Tempère in Tempère & H. Peragallo, 1908 †
- Genus Antelminellia F. Schütt, 1893
- Genus Anthemodiscus J.W. Barker & S.H. Meakin, 1944 †
- Genus Aplotella (Kützing) L. Agassiz, 1843
- Genus Apterosoma S. Komura, 1997 †
- Genus Archepyrgus R. Gersonde & D.M. Harwood, 1990 †
- Genus Argonauta G. Karsten in Engler & Prantl, 1928 †
- Genus Aristella Kützing, 1834
- Genus Arthrogyra Ehrenberg ex Ralfs, 1861
- Genus Arthrotoma Corda, 1840
- Genus Asterodiscus A.S. Johnson, 1852
- Genus Aulacocystis Hassall, 1845
- Genus Auriculopsis Hendey, 1964
- Genus Baikalia L.N. Bukhtiyarova & G.V. Pomazkina, 2013
- Genus Balanosa S. Komura, 1996 †
- Genus Baxteria Van Heurck, 1896
- Genus Belonidium Ehrenberg, 1854 †
- Genus Bogorovia A.P. Jousé, 1966 †
- Genus Bolewskia B. Kwiecinska & J. Sieminska, 2000 †
- Genus Botellus F. Schütt, 1900
- Genus Brachybaculites J. Grüss, 1928 †
- Genus Brasiliella C. Zimmermann, 1918
- Genus Brevilinea P.A. Siver, P.B. Hamilton & E.A. Morales, 2008
- Genus Brevisira Krammer
- Genus Bruniopsis G. Karsten in Engler & Prantl, 1928 †
- Genus Calcothrix N.A. Desvaux in C.A. Agardh, 1830
- Genus Calodiscus L. Rabenhorst, 1853
- Genus Calyptosporium D.M. Harwood & R. Gersonde, 1990 †
- Genus Capsula J. Brun, 1896 †
- Genus Castracania G.B. De Toni, 1892 †
- Genus Cavitatus D.M. Williams, 1989 †
- Genus Centroporus Pantocsek, 1889 †
- Genus Ceratangula P.A. Sims, 2008 †
- Genus Ceratodiscus S.H. Meakin, 1938 †
- Genus Chasea G.D. Hanna, 1934 †
- Genus Cheloniodiscus Pantocsek, 1889 †
- Genus Chrysonema P.L. Anand, 1937 accepted as Ruttnera L. Geitler, 1942
- Genus Chuniella G. Karsten, 1905
- Genus Cladogramma Ehrenberg, 1854 †
- Genus Clavicula Pantocsek, 1886 †
- Genus Clavularia Greville, 1865 †
- Genus Cleveamphora Mereschkowsky, 1903
- Genus Climacidium Ehrenberg, 1870
- Genus Climacosira Grunow, 1862
- Genus Clipeoparvus J. Woodbridge, E.J. Cox & N. Roberts in Woodbridge, Roberts & Cox, 2010
- Genus Coenobiodiscus A.R. Loeblich III, W.W. Wight & W.M. Darley, 1968
- Genus Colletonema Brébisson ex Kützing, 1849
- Genus Corinna P.A.C. Heiberg, 1863 †
- Genus Corona Lefébure & Chenevière, 1938 †
- Genus Coronodiscus I. Suto, 2004 †
- Genus Coscinophaena Ehrenberg, 1854
- Genus Coscinorima N.I. Strelnikova in N.I. Strelnikova & I.V. Makarova, 1999 †
- Genus Cotyledon J. Brun, 1891 †
- Genus Craspedopleura M. Poulin, 1993
- Genus Craspedoporus Greville, 1863 †
- Genus Creswellia Arnott ex Greville in W. Gregory, 1857
- Genus Crossophialus D.M. Harwood & R. Gersonde, 1990 †
- Genus Crucidenticula F. Akiba & Y. Yanagisawa, 1986 †
- Genus Cussia H.J. Schrader, 1974 †
- Genus Cyclosira H. Peragallo & M. Peragallo, 1907
- Genus Cylindropyxis Hendey, 1964
- Genus Cymatotheca N.I. Hendey, 1958
- Genus Cymbelgeia L.N. Bukhtiyarova & G.V. Pomazkina, 2013
- Genus Cymbellopsis Krammer, 1997
- Genus Cymbophora (Kützing) A. de Brebisson, 1838
- Genus Cymbosira Kützing, 1844
- Genus Cypellachaetes D.M. Harwood & R. Gersonde, 1990 †
- Genus Cystopleura Brébisson ex O. Kuntze, 1891
- Genus Dasyangea D.M. Harwood & R. Gersonde, 1990 †
- Genus Debya Pantocsek, 1886 †
- Genus Dichomenis Ehrenberg, 1862
- Genus Dichotropiscus S. Komura, 1995 †
- Genus Dickensoniaforma R.P. Scherer, 1997 †
- Genus Dictyolampra Ehrenberg, 1847 †
- Genus Dictyopyxis C.G. Ehrenberg, 1844 †
- Genus Dimeractis S. Komura, 2001 †
- Genus Diomphala Ehrenberg, 1842 †
- Genus Diprora S.P. Main, 2003
- Genus Discoites J. Grüss, 1928 †
- Genus Disconeis Cleve, 1895
- Genus Discoplea Ehrenberg, 1844
- Genus Discosira L. Rabenhorst, 1853
- Genus Discus Stodder, 1879
- Genus Disiphonia Ehrenberg, 1854
- Genus Dispinodiscus I. Suto, 2004 †
- Genus Doryphora Kützing, 1844
- Genus Dossetia F. Azpeitia, 1911 †
- Genus Echinella Lyngbye, 1819
- Genus Echinodiscus A. Mann, 1925 accepted as Spinodiscus T.V. Desikachary & K.A. Ranjitha Devi in T.V. Desikachary, 1986 †
- Genus Ehrenbergia A. Witkowski, H. Lange-Bertalot & D. Metzeltin, 2000 accepted as Ehrenbergiulva A. Witkowski, H. Lange-Bertalot & D. Metzeltin in A. Witkowski & H. Lange-Bertalot, 2004
- Genus Ehrenbergiulva A. Witkowski, H. Lange-Bertalot & D. Metzeltin in A. Witkowski & H. Lange-Bertalot, 2004
- Genus Entogonia Greville, 1863
- Genus Entomogaster Ehrenberg, 1871
- Genus Epiphalaina R.W. Holmes, S. Nagasawa & H. Takano, 1993
- Genus Epithelion Pantocsek, 1905
- Genus Epithema L.A. de Brébisson, 1838
- Genus Eumeridion Kützing, 1844
- Genus Eunophora W. Vyverman, K. Sabbe & D.G. Mann in W. Vyverman et al., 1998
- Genus Euphyllodium Shadbolt, 1854
- Genus Eupleuria G.A.W. Arnott, 1858
- Genus Eupodiscus C.G. Ehrenberg, 1844
- Genus Eupterotrum S. Komura, 1997 †
- Genus Eurossia P.A. Sims in A.D. Mahood, J.A. Barron & P.A. Sims, 1993 †
- Genus Falcatella L. Rabenhorst, 1853
- Genus Flexibiddulphia R. Simonsen, 1987 †
- Genus Fontigonium P.A. Sims & N.I. Hendey, 1996
- Genus Fragilariella N.I. Hendey, 1958
- Genus Gato C.S. Lobban & J.N. Navarro, 2013
- Genus Girodella Gaillon ex Turpin, 1827
- Genus Gleseria E.G. Lupikina & L.M. Dolmatova, 1984 †
- Genus Gloeonema Ehrenberg, 1856 accepted as Gloionema C.A. Agardh, 1812
- Genus Gloeonema Agassiz, 1846 accepted as Gloionema C.A. Agardh, 1812
- Genus Gloionema C.A. Agardh, 1812
- Genus Gloionema Bory de St. Vincent, 1825 accepted as Gloionema C.A. Agardh, 1812
- Genus Glyphodiscus Greville, 1862
- Genus Goldfishia L.N. Bukhtiyarova & G.V. Pomazkina, 2013
- Genus Golovenkinia N.I. Strelnikova, 1997 †
- Genus Gomphogramma A. Braun in Rabenhorst, 1853
- Genus Gomphonella Rabenhorst, 1853
- Genus Goniothecium Ehrenberg, 1843 †
- Genus Grammatonema Kutzing, 1845
- Genus Grayia E. Grove & J. Brun in A. Schmidt, 1892 †
- Genus Groentvedia Hendey, 1964
- Genus Grovea A. Schmidt ex Van Heurck, 1896 †
- Genus Grunoviella H. Van Heurck, 1896
- Genus Gutwinskiella G.B. De Toni, 1894 †
- Genus Gyropandorus S. Komura, 1997 †
- Genus Gyroptychus A. Schmidt, 1890 †
- Genus Halionyx Ehrenberg, 1844
- Genus Halurina Zimmermann, 1918
- Genus Hamatusia S.R. Stidolph, 1993
- Genus Handmannia M. Peragallo, 1913
- Genus Hantzschiopsidea J. Grüss, 1928 †
- Genus Haynaldella Pantocsek, 1892
- Genus Heibergia Greville, 1865 †
- Genus Heliopelta Ehrenberg, 1844
- Genus Helisella A. Jurilj, 1948
- Genus Helminthopsidella P.C. Silva, 1970 †
- Genus Helminthopsis Heurck, 1896 accepted as Helminthopsidella P.C. Silva, 1970 †
- Genus Hemiboscia V.A. Nikolaev & D.M. Harwood, 2012 †
- Genus Hemizoster Ehrenberg, 1844
- Genus Hendeya J.A. Long, D.P. Fuge & J. Smith, 1946
- Genus Henseniella Schütt ex G.B. De Toni, 1894
- Genus Henshawia A. Mann, 1925
- Genus Hercotheca Ehrenberg, 1844 †
- Genus Heribaudia M. Peragallo in Héribaud, 1893 †
- Genus Hesslandia Cleve-Euler in Cleve-Euler & Hessland, 1947
- Genus Heterangion S. Komura, 2001 †
- Genus Heterocampa Ehrenberg, 1870 †
- Genus Heterodictyon Greville, 1863 †
- Genus Heteromphala Ehrenberg, 1859
- Genus Heteroneis Cleve, 1895
- Genus Heterostephania Ehrenberg, 1854
- Genus Himantidium Ehrenberg, 1840
- Genus Homalodiscus A.S. Örsted, 1844
- Genus Hormophora A. Jurilj, 1957
- Genus Horodiscus G.D. Hanna, 1927 †
- Genus Hustedtia F. Meister, 1932
- Genus Hyalodictya Ehrenberg, 1871
- Genus Hyalotrochus D.M. Harwood & R. Gersonde, 1990 †
- Genus Hydrolinum H.F. Link in C.G.D. Nees, 1820
- Genus Hydrosirella F. Hustedt, 1952 †
- Genus Iconella A. Jurilj, 1948
- Genus Ikebea S. Komura, 1975 †
- Genus Imparvalvia S. Komura, 1992 †
- Genus Incisoria M. Hajós, 1975 †
- Genus Insilella Ehrenberg, 1845
- Genus Isthmiella Cleve, 1873
- Genus Janischia Grunow in Van Heurck, 1883
- Genus Katahiraia S. Komura, 1976 †
- Genus Kentrodiscus Pantocsek, 1889 †
- Genus Kidoa S. Komura, 1979 †
- Genus Klinodiscus A. Jurilj, 1949
- Genus Kozloviella A.P. Jousé, 1974
- Genus Kreagra R. Gersonde & D.M. Harwood, 1990 †
- Genus Kuemmerlea J.A. Krenner, 1926
- Genus Lacustriella H. Lange-Bertalot, M.S. Kulikovskiy & D. Metzeltin in Kulikovskiy, Lange-Bertalot, Metzeltin & Witkowski, 2012
- Genus Lamella J. Brun, 1894
- Genus Lamprotediscus Pantocsek, 1892 †
- Genus Lancineis G.W. Andrews, 1990 †
- Genus Leptoscaphos H.-J. Schrader, 1969 †
- Genus Leudugeria Tempère ex Van Heurck, 1896
- Genus Lioneis Ehrenberg, 1861
- Genus Liostephania Ehrenberg, 1847 †
- Genus Liparogyra Ehrenberg, 1848
- Genus Liradiscus Greville, 1865 †
- Genus Liriogramma Kolbe in H. Pettersson, 1954
- Genus Lisitzinia A.P. Jousé, 1978 †
- Genus Lomonycus S. Komura, 1996 †
- Genus Longinata M. Hajós, 1975 †
- Genus Lophotheca H.-J. Schrader, 1969 †
- Genus Lunella P. Snoeijs, 1996
- Genus Lyngbyea S.C. Sommerfelt, 1826
- Genus Lysigonium H.F. Link in C.G.D. Nees, 1820
- Genus Mammidion J.A. Long, D.P. Fuge & J. Smith, 1946 †
- Genus Mammula G. Karsten in Engler & Prantl, 1928 †
- Genus Mediaria Sheshukova-Poretzkaya, 1962 †
- Genus Melchersiela C. Teixeira, 1959
- Genus Meristosolen D.M. Harwood & R. Gersonde, 1990 †
- Genus Mesasterias Ehrenberg, 1872
- Genus Micromega C.A. Agardh, 1827
- Genus Microneis Cleve, 1895
- Genus Microorbis R. Gersonde & D.M. Harwood, 1990 †
- Genus Microstigma (Cleve) F. Meister, 1919
- Genus Moisseevia N.I. Strelnikova, 1997 †
- Genus Monema Greville, 1827
- Genus Monobrachia H.J. Schrader in H.J. Schrader & J. Fenner, 1976 †
- Genus Monogramma Ehrenberg, 1843
- Genus Monopsia E. Grove & G. Sturt, 1887 †
- Genus Nadiya L.N. Bukhtiyarova in Bukhtiyarova & Pomazkina, 2013
- Genus Nanoneis R.E. Norris, 1973
- Genus Naunema Ehrenberg, 1838
- Genus Naviculonema C.L. Graeff, J.P. Kociolek & S.R. Rushforth, 2013
- Genus Navigeia L.N. Bukhtiyarova in Bukhtiyarova & Pomazkina, 2013
- Genus Nematoplata Bory de Saint-Vincent, 1822
- Genus Neograya O. Kuntze, 1898 †
- Genus Nephrodiscus S. Komura, 1996 †
- Genus Ninastrelnikovia H. Lange-Bertalot & A. Fuhrmann, 2014
- Genus Nitzschiopsidea J. Grüss, 1928 †
- Genus Nothoceratium G.B. De Toni, 1894
- Genus Ochigma M.S. Kulikovskiy, H. Lange-Bertalot & D. Metzeltin in Kulikovskiy, Lange-Bertalot, Metzeltin & Witkowski, 2012
- Genus Odontidium Kützing, 1844
- Genus Odontotropis Grunow, 1884 †
- Species Odontotropis birostrata Pantocsek
- Species Odontotropis calamus (Tempère & Brun) De Toni
- Species Odontotropis carinata (Grunow) Grunow
- Species Odontotropis circularis Wise
- Species Odontotropis cristata (Grunow) Grunow
- Species Odontotropis galeonis Hanna
- Species Odontotropis hyalina W. Witt
- Species Odontotropis longispina (Grunow) De Toni
- Species Odontotropis tenuicornis (Greville) De Toni
- Species Odontotropis vitrea Pantocsek
- Genus Okedenia Eulenstein ex G.B. De Toni, 1891
- Genus Omphalopelta Ehrenberg, 1844
- Genus Omphalotheca Ehrenberg, 1854
- Genus Oncosphenia Ehrenberg, 1845
- Genus Opephoropsis J. Frenguelli, 1945
- Genus Orthoneis Grunow, 1870
- Genus Oshitea S. Komura, 1993 †
- Genus Paleopandorus S. Komura, 1996 †
- Genus Paltonella (Kützing) L. Agassiz, 1843
- Genus Pandurella (Kützing) L. Agassiz, 1843
- Genus Pantocsekia Grunow ex Pantocsek, 1886 †
- Genus Pentapodiscus Ehrenberg, 1843
- Genus Peponia Greville, 1863 †
- Genus Peragallia F. Schütt, 1895
- Genus Periptera Ehrenberg, 1844
- Genus Peristephania Ehrenberg, 1854
- Genus Perithyra Ehrenberg ex H. Van Heurck, 1896
- Genus Perizonia Cohn & Janisch ex Rabenhorst, 1864
- Genus Perizonium F. Cohn & C. Janisch ex L. Rabenhorst, 1864
- Genus Phacodiscus Meunier, 1907
- Genus Pharyngoglossa Corda, 1835
- Genus Phialediscus L. Vailionis, 1930
- Genus Phlyctaenia Kützing, 1849
- Genus Phycorona S. Blanco, 2020 † accepted as Corona Lefébure & Chenevière, 1938 †
- Genus Pinnulariosigma T.V. Desikachary, V.N. Raja Rao & V.T. Sridharan in T.V. Desikachary, 1989
- Genus Pleurodesmium Kützing, 1846
- Genus Pleurodiscina P.C. Silva, 1970 †
- Genus Pleurodiscus J.W. Barker & S.H. Meakin, 1944 † accepted as Pleurodiscina P.C. Silva, 1970 †
- Genus Pleuroneis Cleve, 1895
- Genus Pleurosiphonia Ehrenberg, 1871
- Genus Ploiaria Pantocsek ex Van Heurck, 1896 †
- Genus Podiscus J.W. Bailey, 1844
- Genus Pododiscus Kützing, 1844
- Genus Podosphenia Ehrenberg, 1836
- Genus Pogoneis F.E. Round & P.W. Basson, 1997
- Genus Pontodiscus D.N. Temniskova-Topalova & V.S. Sheshukova-Poretzkaya in D.N. Temniskova-Topalova et al., 1981 †
- Genus Poretzkia Jousé, 1949 †
- Genus Porocyclia C.G. Ehrenberg, 1848
- Genus Porodiscus Greville, 1863 †
- Genus Porostauros F. Habirshaw, 1877
- Genus Porosularia Skvortzov, 1976
- Genus Pravifusus Witkowski
- Genus Pritchardia L. Rabenhorst, 1864
- Genus Proboscidea T.B.B. Paddock & P.A. Sims, 1980
- Genus Proboscineis F. Butzin, 1980
- Genus Prorostaurus Ehrenberg, 1843
- Genus Protorhaphoneis B. Kwiecinska & J. Sieminska, 2000 †
- Genus Psammoparalia M.G. Baptista, 1998
- Genus Pseudoamphiprora (Cleve) Cleve, 1894 †
- Genus Pseudocerataulus Pantocsek, 1889
- Genus Pseudodictyoneis Cleve ex Pantocsek, 1892
- Genus Pseudodimerogramma H.J. Schrader in H.J. Schrader & J. Fenner, 1976 †
- Genus Pyrgodiscus F. Kitton ex Cleve, 1885 †
- Genus Radiodiscus A. Forti & P. Schulz, 1932 † accepted as Schulziella Hanna & Forti, 1933 †
- Genus Radiodiscus (Bale) Mills, 1932
- Genus Radiopalma J. Brun, 1891 †
- Genus Ralfsia O'Meara, 1875
- Genus Rancia L. Mangin ex J. Chavaillon, 1939
- Genus Reicheltia H. Van Heurck, 1896
- Genus Rhabdium C.F.W. Wallroth, 1833
- Genus Rhabdosira Ehrenberg, 1870
- Genus Rhipidophora Kützing, 1844
- Genus Rhizonotia Ehrenberg, 1843
- Genus Robinsonetta G.D. Hanna & A.L. Brigger, 1964 †
- Genus Rosaria Carmichael ex Harvey, 1833
- Genus Rouxia J. Brun & Héribaud in Héribaud, 1893 †
- Genus Rouxiopsis S. Komura, 1996 †
- Genus Rutilariopsis Van Heurck, 1896 †
- Genus Saeptifera R.M. Gogorev in Gogorev & Pushina, 2014 †
- Genus Sagittula S. Komura, 1997 †
- Genus Salacia Pantocsek, 1889
- Genus Sameioneis D.J. Russell & R.E. Norris, 1971
- Genus Sawamuraia S. Komura, 1976 †
- Genus Scalariella C. Riaux-Gobin in Riaux-Gobin, Witkowski & Ruppel, 2012
- Genus Scalptrum A.C.J. Corda, 1835
- Genus Schimperiella G. Karsten, 1905
- Genus Schizonema C.A. Agardh, 1824
- Genus Schizostauron Grunow, 1867
- Genus Schmidtiella C.H. Ostenfeld, 1903
- Genus Schuettia G.B. De Toni, 1894
- Genus Schulziella Hanna & Forti, 1933 †
- Genus Scoliodiscus A. Jurilj, 1954
- Genus Secallia F. Azpeitia, 1911
- Genus Semseyia Pantocsek, 1902
- Genus Sieminskia D. Metzeltin & Lange-Bertalot, 1998
- Genus Sigma M. Peragallo in Héribaud, 1920
- Genus Sigmatella Kützing, 1833
- Genus Simonseniella J. Fenner, 1991 †
- Genus Siphonodiscus S. Komura, 1996 †
- Genus Skvortzowia M.S. Kulikovskiy, H. Lange-Bertalot & D. Metzeltin in Kulikovskiy, Lange-Bertalot, Metzeltin & Witkowski, 2012
- Genus Slavia L.N. Bukhtiyarova & G.V. Pomazkina, 2013
- Genus Solium Heiberg, 1863 †
- Genus Sphaerophora (A.H. Hassall) J. Lindley, 1846
- Genus Sphenella Kützing, 1844
- Genus Sphenella (Kützing) L. Agassiz, 1843
- Genus Sphenoneis V.B.A. Trevisan, 1848 accepted as Sphenella Kützing, 1844
- Genus Sphenophora Kützing, 1833
- Genus Sphenosira Ehrenberg, 1843
- Genus Sphinctocystis Hassall, 1845
- Genus Spinigera Heiden & Kolbe, 1928
- Genus Spinivinculum R. Ross, 1990 †
- Genus Spinodiscus T.V. Desikachary & K.A. Ranjitha Devi in T.V. Desikachary, 1986 †
- Genus Staurogramma L. Rabenhorst, 1853
- Genus Stauronella Mereschkowsky, 1901
- Genus Staurosigma Grunow ex Rabenhorst, 1864
- Genus Staurosira P. Petit ex Pelletan, 1889
- Genus Stelladiscus J. Rattray, 1890
- Genus Stelodiscus S. Komura, 2001 †
- Genus Stephanogonia Ehrenberg, 1844 †
- Genus Stephanosira C.G. Ehrenberg, 1848
- Genus Stichochrysis E.G. Pringsheim, 1955
- Genus Stichocrysis
- Genus Stictodesmis Greville, 1863
- Genus Stictolecanon S. Komura, 1999 †
- Genus Stigmaphora G.C. Wallich, 1860
- Genus Stoschiella C. Gardner & K. Wenderoth in C. Gardner et al., 1996
- Genus Streptommion S. Komura, 1997 †
- Genus Strombus F. Schütt ex A.F. Castracane, 1892
- Genus Sturtgrovea O. Kuntze, 1898
- Genus Stylobiblium Ehrenberg, 1845 †
- Genus Suriraya E. Pfitzer, 1871
- Genus Symblepharis Ehrenberg, 1873
- Genus Syncyclia Ehrenberg, 1837
- Genus Syndendrium Ehrenberg, 1845 †
- Genus Syringidium Ehrenberg, 1845
- Genus Syrinx A.C.J. Corda, 1835
- Genus Systephania C.G. Ehrenberg, 1844 †
- Genus Tabulina J. Brun, 1889 †
- Genus Temperea M. Peragallo in Tempère & H. Peragallo, 1908
- Genus Terebraria Greville, 1864 †
- Genus Tetrachaeta Ehrenberg, 1844
- Genus Tetramphora C. Mereschkowsky, 1903
- Genus Tetrapodiscus Ehrenberg, 1843
- Genus Thumia Cleve ex Lefébure & Chenevière, 1938
- Genus Tibiella C.E. Bessey, 1900 †
- Genus Tortilaria J.W. Barker & S.H. Meakin, 1948
- Genus Tribrachia A. Mann, 1925 accepted as Pseudotribrachia S. Blanco & C.E. Wetzel, 2016
- Genus Trifonovia M.S. Kulikovskiy & H. Lange-Bertalot in Kulikovskiy, Lange-Bertalot, Metzeltin & Witkowski, 2012
- Genus Tripterion R.W. Holmes, S. Nagasawa & H. Takano, 1993
- Genus Trochosirella S. Komura, 1996 †
- Genus Trochus R. Gersonde & D.M. Harwood, 1990 †
- Genus Tropidosiphonus S. Komura, 1994 †
- Genus Truania Pantocsek, 1886 †
- Genus Tschestnovia Pantocsek, 1889
- Genus Tubaformis A.M. Gombos Jr., 1983 †
- Genus Tubularia Brun, 1894
- Genus Tursiocola R.W. Holmes, S. Nagasawa & H. Takano, 1993
- Genus Undatodiscus E.G. Lupikina, 1984 †
- Genus Unguiella S. Komura, 1996 †
- Genus Upothema J.A. Long, D.P. Fuge & J. Smith, 1946 †
- Genus Valdiviella A.F.W. Schimper in G.H.H. Karsten, 1907
- Genus Vanheurckiella Pantocsek ex M. Peragallo, 1897 †
- Genus Vanhoeffenus Heiden & Kolbe in Drygalski, 1928
- Genus Vikingea Witkowski
- Genus Vulcanella P.A. Sims & A.D. Mahood, 1998 †
- Genus Willemoesia F. Castracane, 1886
- Genus Williamsella C.L. Graeff, J.P. Kociolek & S.R. Rushforth, 2013
- Genus Williamsonia P. Lefébure, 1947
- Genus Wittia Pantocsek, 1889 †
- Genus Xanthiopyxis (Ehrenberg) Ehrenberg, 1845 †
- Genus Zotheca Pantocsek, 1902
- Phylum Bigyra
- Phylum Chrysophyta accepted as Ochrophyta
- Phylum Diatomaceae accepted as Bacillariophyta
- Phylum Eustigmatophyta accepted as Ochrophyta
- Phylum Heterokontophyta accepted as Ochrophyta
- Phylum Hyphochytriomycota accepted as Pseudofungi
- Phylum Labyrinthista accepted as Bigyra
- Phylum Ochrophyta
- Phylum Oomycota accepted as Pseudofungi
- Phylum Phaeophyta accepted as Ochrophyta
- Phylum Pseudofungi
- Phylum Raphidophyta accepted as Ochrophyta
- Phylum Sagenista accepted as Bigyra
- Phylum Xanthophyta accepted as Ochrophyta
- Subphylum Bigyromonada
- Class Bigyromonadea accepted as Developea
- Family Kaonashiidae Weston, Eglit & Simpson, 2023
- Infrakingdom Rhizaria
- Kingdom Fungi
- Kingdom Plantae
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Kingdom Viruses
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