DiatomBase
Between brackets is the number of accepted extant species
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- Bacillariophyceae (5 957)
- Subclass Bacillariophyceae incertae sedis (189)
- Subclass Bacillariophycidae (4 408)
- Subclass Coscinodiscophycidae (877)
- Subclass Fragilariophycidae (483)
- Superorder Fragilariophycanae (483)
- Order Ardissoneales (1)
- Order Climacospheniales (2)
- Order Cyclophorales (8)
- Order Fragilariales (377)
- Family Fragilariaceae Greville, 1833 (377)
- Genus Adoneis G.W. Andrews & P. Rivera, 1987 (1)
- Genus Andrewsiella T.Jurkschat, 1997 †
- Genus Asterionella A.H. Hassall, 1850 (4)
- Genus Asterionellopsis F.E. Round in F.E. Round, R.M. Crawford & D.G. Mann, 1990 (2)
- Genus Asteroplanus C. Gardner & R.M. Crawford in R.M. Crawford & C. Gardner, 1997
- Genus Bleakeleya F.E. Round in F.E. Round, R.M. Crawford & D.G. Mann, 1990
- Genus Brandinia L.F. Fernandes in Fernandes, Procopiak & Portinho, 2007
- Genus Brassierea M.K.Hein & B.M.Winsborough, 1999
- Genus Castoridens Ashworth, Chunlian Li & Witkowski, 2016 (2)
- Genus Catacombas D.M. Williams & F.E. Round, 1986
- Genus Centronella M. Voigt, 1902
- Genus Ceratoneis C.G. Ehrenberg, 1839 accepted as Cylindrotheca L. Rabenhorst, 1859 (3)
- Genus Cratericulifera Chunlian Li, Witkowski & Ashworth, 2016 (2)
- Genus Ctenophora (Grunow) D.M.Williams & Round, 1986 (2)
- Genus Ctenophora A. Grunow, 1862
- Genus Desikaneis A.K.S.K. Prasad in A.K.S.K. Prasad & R.J. Livingston, 1993 (1)
- Genus Diatoma J.B.M. Bory de Saint-Vincent, 1824 (13)
- Genus Distrionella D.M. Williams, 1990 (2)
- Genus Falcula M. Voigt, 1960 (1)
- Genus Fossula G.R. Hasle, E.E. Syvertsen & C.H. von Quillfeldt, 1996 accepted as Fossulaphycus Blanco, 2020
- Genus Fossulaphycus Blanco, 2020 (1)
- Genus Fragilaria H.C. Lyngbye, 1819 (100)
- Species Fragilaria acerba Cholnoky, 1966
- Species Fragilaria acerosa Van de Vijver, C.E.Wetzel, Jarlman et Ector in Van de Vijver, 2022
- Species Fragilaria acidobiontica D.F.Charles, 1986
- Species Fragilaria acidoclinata Lange-Bertalot & G.Hofmann, 1993
- Species Fragilaria aconcinnum Estep & Remsen, 1983
- Species Fragilaria acus (Kützing) Lange-Bertalot in Krammer & Lange-Bertalot, 2000
- Species Fragilaria acuta Ehrenberg, 1840
- Species Fragilaria acuta auct. non Ehrenberg, 1917
- Species Fragilaria acuta sensu Mayer, 1916
- Species Fragilaria acutirhombica Metzeltin, Lange-Bertalot & Nergui, 2009
- Species Fragilaria acutirostrata Metzeltin & Lange-Bertalot, 1998
- Species Fragilaria acutiuscula Pantocsek, 1902
- Species Fragilaria adamsii Cholnoky, 1964
- Species Fragilaria advena VanLandingham, 1971
- Species Fragilaria aequalis Heiberg, 1863 accepted as Fragilariforma virescens (Ralfs) D.M.Williams & Round, 1988
- Species Fragilaria aethiopica G. S. West, 1907
- Species Fragilaria affinis Hofmann Bang, 1824
- Species Fragilaria africana Hustedt, 1949
- Species Fragilaria agnesiae Kahlert & Rimet, 2019
- Species Fragilaria alpestris Krasske ex Hustedt, 1931
- Species Fragilaria alternata Frenguelli, 1941
- Species Fragilaria amicorum Witkowski & Lange-Bertalot, 1993
- Species Fragilaria amphicephala Ehrenberg, 1854
- Species Fragilaria amphicephaloides Lange-Bertalot, 2013
- Species Fragilaria amphiceros Ehrenberg
- Species Fragilaria amphilepta (Ehrenberg) Ralfs in Pritchard, 1861
- Species Fragilaria amphioxys Ehrenberg, 1854
- Species Fragilaria anceps Ehrenberg, 1843
- Species Fragilaria andreseniana Alexson, Reavie & Van de Vijver in Alexson et al., 2022
- Species Fragilaria angusta Ehrenberg, 1838
- Species Fragilaria angustata Cleve & Grove, 1891
- Species Fragilaria annulata (Corda) Corda, 1840 accepted as Syrinx annulatum Corda, 1835
- Species Fragilaria anomala W. Smith
- Species Fragilaria antarctica Castracane, 1886 accepted as Fragilariopsis kerguelensis (O'Meara) Hustedt, 1952
- Species Fragilaria antarctica van Heurck, 1909 accepted as Fragilariopsis obliquecostata (van Heurck) Heiden, 1928
- Species Fragilaria antarctica Schwarz ex Otto Muller, 1877
- Species Fragilaria aquaplus H.Lange-Bertalot & S.Ulrich, 2014
- Species Fragilaria araulensis Héribaud, 1908
- Species Fragilaria arctica Grunow, 1880 accepted as Fragilariopsis oceanica (Cleve) Hasle, 1965
- Species Fragilaria arctica (Grunow) M.Poulin, L.Bérard-Therriault & A.Cardinal, 1984 accepted as Synedra arctica Grunow, 1862
- Species Fragilaria arcuata Schumann, 1862
- Species Fragilaria arcus (Ehrenberg) Cleve, 1898 accepted as Eunotia arcus Ehrenberg, 1837
- Species Fragilaria asiatica Hustedt, 1922
- Species Fragilaria atomus Hustedt, 1931
- Species Fragilaria aurea Carmichael in Hooker, 1833
- Species Fragilaria aurivillii Cleve, 1901
- Species Fragilaria australis Ehrenberg, 1854
- Species Fragilaria austriaca (Grunow) Lange-Bertalot, 2000
- Species Fragilaria bacillum Ehrenberg, 1844
- Species Fragilaria bacillum M. Peragallo in Héribaud et al., 1920
- Species Fragilaria baculus Østrup, 1918 (1920)
- Species Fragilaria bahlsiana Van de Vijver, C.E.Wetzel et Ector in Van de Vijver et al., 2022
- Species Fragilaria balatonis Pantocsek, 1902
- Species Fragilaria barbararum Witkowski, Metzeltin & Lange-Bertalot, 1996
- Species Fragilaria barbatula (Kützing) Lange-Bertalot, 1993 accepted as Tabularia barbatula (Kützing) D.M.Williams & Round, 1986
- Species Fragilaria berggrenii (Cleve)
- Species Fragilaria berolinensis (Lemmermann) Lange-Bertalot, 1993 accepted as Synedra berolinensis var. berolinensis Lemmermann, 1900
- Species Fragilaria bicapitata Mayer, 1917 accepted as Fragilariforma bicapitata (Mayer) D.M.Williams & Round, 1988
- Species Fragilaria biceps (Kützing) Lange-Bertalot, 1991 accepted as Ulnaria biceps (Kützing) P.Compère, 2001
- Species Fragilaria biceps Ehrenberg, 1843
- Species Fragilaria biceps (Kützing) Lange-Bertalot, 1993 accepted as Synedra biceps f. biceps Kützing, 1844
- Species Fragilaria biceps Pantocsek, 1902
- Species Fragilaria biconstricta (Rabenhorst) Schumann, 1867
- Species Fragilaria bidens Heiberg, 1863
- Species Fragilaria bigibba Héribaud, 1903
- Species Fragilaria billingsii Wengrat, C.E. Wetzel & E. Morales, 2016
- Species Fragilaria binalis Ehrenberg, 1854
- Species Fragilaria binodis Ehrenberg, 1854
- Species Fragilaria binodis Pantocsek, 1902
- Species Fragilaria binodis auct. non Ehrenberg
- Species Fragilaria bipunctata Ehrenberg, 1838
- Species Fragilaria bipunctata Rabenhorst, 1861-1879
- Species Fragilaria birostris Ehrenberg, 1844
- Species Fragilaria bituminosa Pantocsek
- Species Fragilaria bivittata Pantocsek, 1892
- Species Fragilaria bongrainii M. Peragallo, 1921
- Species Fragilaria boreomongolica Kulikovskiy, Lange-Bertalot, Witkowski & Dorofeyuk, 2010
- Species Fragilaria braunii Hustedt, 1952 accepted as Torgania braunii (Hustedt) L.G.C.Canani & D.M. Talgatti in Canani et al., 2020
- Species Fragilaria brevis Montagne, 1842
- Species Fragilaria brevistriata Grunow, 1885
- Species Fragilaria bronkei A. Witkowski, H. Lange-Bertalot & D. Metzeltin, 2000 accepted as Pseudostaurosira bronkei (Witkowski, Lange-Bert. & Metzeltin) C.E.Wetzel & E.Morales, 2019
- Species Fragilaria californica Grunow in Van Heurck, 1881
- Species Fragilaria calmelsi Lauby, 1910
- Species Fragilaria campyla (Hilse) Van de Vijver, Kusber et D.M.Williams in Van de Vijver et al., 2022
- Species Fragilaria camtschatica (Grunow) Poulin, Berard-Therriault & Cardinal, 1984 accepted as Synedra camtschatica var. camtschatica Grunow, 1862
- Species Fragilaria canariensis Lange-Bertalot, 1993
- Species Fragilaria candidagilae Almeida, C. Delgado, Novais & S. Blanco in Delgado et al., 2015
- Species Fragilaria capensis Grunow, 1863
- Species Fragilaria capensis Cholnoky, 1959
- Species Fragilaria capensis Karsten, 1905
- Species Fragilaria capitata (Ehrenberg) Lange-Bertalot, 1980 accepted as Synedra capitata f. capitata Ehrenberg, 1836
- Species Fragilaria capitellata (Grunow) J.B.Petersen, 1946 accepted as Fragilaria recapitellata H. Lange-Bertalot & D. Metzeltin, 2009
- Species Fragilaria capitellata Lauby, 1910
- Species Fragilaria capucina Desmazières, 1830
- Species Fragilaria capucina (Kützing) Lange-Bertalot, 1993
- Species Fragilaria capucina (Grunow) Lange-Bertalot, 1993
- Species Fragilaria capucina (Kützing) Lange-Bertalot, 1993 accepted as Synedra amphicephala var. amphicephala Kützing, 1844
- Species Fragilaria capucina auct. non Desmazieres
- Species Fragilaria carmichaelii Harvey, 1841
- Species Fragilaria carnea H.C.Lyngbye
- Species Fragilaria cassubica Witkowski & Lange-Bertalot, 1993
- Species Fragilaria castracanei De Toni
- Species Fragilaria catena Ehrenberg, 1840
- Species Fragilaria cerealis Cholnoky, 1959
- Species Fragilaria charcotii M. Peragallo, 1921
- Species Fragilaria chilensis (Krasske) Lange-Bertalot in Lange-Bertalot, Kulbs, Lauser, Norpel-Schempp & Willmann, 1996 accepted as Ceratoneis chilensis Krasske, 1939
- Species Fragilaria circumnodosa Brun, 1901
- Species Fragilaria clevei Pantocsek
- Species Fragilaria coccochroma Mereschkowsky, 1901
- Species Fragilaria coccochromatica Mereschkowsky, 1902
- Species Fragilaria cochabambina Morales, 2009
- Species Fragilaria confervacea Greville ex Hooker, 1833
- Species Fragilaria confervoides Greville, 1833
- Species Fragilaria confusa Van de Vijver, Tusset, D.M.Williams & Ector, 2020
- Species Fragilaria constricta Ehrenberg, 1843
- Species Fragilaria constricta auct. non Ehrenberg
- Species Fragilaria construens (Ehrenberg) Grunow, 1862
- Species Fragilaria construens auct. non Ehrenberg
- Species Fragilaria contracta Schumann, 1862
- Species Fragilaria convexa Tynni, 1982
- Species Fragilaria corrugata Kützing, 1844
- Species Fragilaria costata (Rehakova) Lange-Bertalot in Lange-Bertalot, Rumrich & Hofmann, 1991
- Species Fragilaria costata Meister, 1937
- Species Fragilaria costata M. Peragallo in Héribaud, 1903
- Species Fragilaria crassa Metzeltin & Lange-Bertalot, 1998
- Species Fragilaria crassa K.E. Lohman, 1957
- Species Fragilaria crassirhombica Metzeltin, Lange-Bertalot & Nergui, 2009
- Species Fragilaria cretae Ehrenberg, 1854
- Species Fragilaria crotonensis Kitton, 1869
- Species Fragilaria crux Ehrenberg, 1854
- Species Fragilaria cuneata Ehrenberg, 1856
- Species Fragilaria curta Van Heurck, 1909
- Species Fragilaria curvata Skvortzow, 1935
- Species Fragilaria curvistriata Lohman & Andrews, 1968
- Species Fragilaria cyclopum (Brutschy) Lange-Bertalot, 1980 accepted as Synedra cyclopum f. cyclopum Brutschy, 1922
- Species Fragilaria cylindrus Grunow, 1883
- Species Fragilaria danica (Kützing) Lange-Bertalot, 1996 accepted as Synedra danica Kützing, 1844
- Species Fragilaria deformis (W.Sm.) Van de Vijver & Ector in Van de Vijver et al., 2020
- Species Fragilaria delicata K.E. Lohman, 1957
- Species Fragilaria delicatissima (W.Smith) Lange-Bertalot, 1980 accepted as Synedra delicatissima f. delicatissima W. Smith, 1853
- Species Fragilaria delicatissima Proschkina-Lavrenko, 1960
- Species Fragilaria delicatula Schoeman, 1973
- Species Fragilaria demerarae (Grunow) Lange-Bertalot, 1980 accepted as Synedra demerarae Grunow, 1881
- Species Fragilaria densestriata Hustedt, 1938
- Species Fragilaria denticulata Lohman & Andrews, 1968
- Species Fragilaria diatomoides Greville in Hooker, 1833
- Species Fragilaria diatomoides Harvey, 1841
- Species Fragilaria dibolos M.H.Hohn & J.Hellerman, 1963
- Species Fragilaria dilatata (Brébisson) Lange-Bertalot, 1993 accepted as Frustulia dilatata Brébisson, 1838
- Species Fragilaria dimeregramma Wolle, 1890
- Species Fragilaria diophthalma (Ehrenberg) Ehrenberg
- Species Fragilaria diophthalma Hemprich & Ehrenberg
- Species Fragilaria distans (Grunow) Bukhtiyarova, 1995
- Species Fragilaria dorsiventralis (Otto Müller) Lange-Bertalot, 1980
- Species Fragilaria dubia Grunow, 1862 accepted as Hendeyella dubia (Grun. in van Heurck, 1862) Chunlian Li, Witkowski & Ashworth, 2016
- Species Fragilaria durietzii Cleve-Euler, 1940
- Species Fragilaria dzonoticola E. Novelo, R. Tavera & C. Ibarra, 2007
- Species Fragilaria ehrenbergii Corda, 1840
- Species Fragilaria eichhornii Witkowski & Lange-Bertalot, 1995
- Species Fragilaria elliptica Schumann, 1867 accepted as Pseudostaurosira elliptica (Schumann) Edlund, Morales & Spaulding, 2006
- Species Fragilaria elliptica Jousé, 1955
- Species Fragilaria endocystifera Héribaud, 1908
- Species Fragilaria entomon (Ehrenberg) Ehrenberg
- Species Fragilaria estherae Hajós, 1973
- Species Fragilaria esthereia Hajós, 1971
- Species Fragilaria eugramma Ehrenberg, 1856
- Species Fragilaria eunotia Ehrenberg, 1854
- Species Fragilaria eutraphenta Van de Vijver, Kusber et D.M.Williams
- Species Fragilaria excissa Corda, 1840
- Species Fragilaria exigua Grunow, 1878
- Species Fragilaria exigua (W.Smith) Lemmermann, 1908 accepted as Staurosira construens var. exigua (W.Smith) H.Kobayasi, 2002
- Species Fragilaria exiguiformis Lange-Bertalot, 1993
- Species Fragilaria exiguissima Archibald, 1966
- Species Fragilaria exilis Grunow, 1863
- Species Fragilaria famelica (Kützing) Lange-Bertalot, 1980 accepted as Synedra famelica var. famelica Kützing, 1844
- Variety Fragilaria famelica var. littoralis (H. Germain) Lange-Bertalot in Krammer & Lange-Bertalot, 1991
- Species Fragilaria familaris (Kützing) Hustedt, 1957
- Species Fragilaria fasciata Lyngbye, 1819
- Species Fragilaria fasciculata (C.Agardh) Lange-Bertalot, 1980 accepted as Tabularia fasciculata (C.Agardh) D.M.Williams & Round, 1986
- Species Fragilaria fayoumensis Aleem, 1958
- Species Fragilaria fenestrata Vinogradov, 1944
- Species Fragilaria fissa Ehrenberg, 1838
- Species Fragilaria flavovirens Takano, 1986
- Species Fragilaria flexura U. Hoff & H. Lange-Bertalot, 2011
- Species Fragilaria floridana Hanna, 1933
- Species Fragilaria foliolum (Corda) Corda, 1840 accepted as Paradesmus foliolum Corda, 1835
- Species Fragilaria fonticola Hustedt
- Species Fragilaria fossilis (Pantocsek) Lange-Bertalot in Lange-Bertalot, Rumrich & Hofmann, 1991
- Species Fragilaria fossilis Hajós, 1973
- Species Fragilaria fossilis Hajós, 1974
- Species Fragilaria fragilariodes (Grunow in Van Heurck) Cholnoky, 1963
- Species Fragilaria fragilarioides (Grunow) Cholnoky, 1963
- Species Fragilaria frémontii Ehrenberg, 1870
- Species Fragilaria frustulia Ehrenberg, 1854
- Species Fragilaria fusa (R.M. Patrick, 1941) Wengrat, C.E. Wetzel & E. Morales, 2016
- Species Fragilaria fusus Ehrenberg, 1856
- Species Fragilaria gaillonii (Bory) Lange-Bertalot
- Species Fragilaria gallionella Ehrenberg, 1848
- Species Fragilaria gedanensis Witkowski, 1993
- Species Fragilaria geocollegarum Witkowski & Lange-Bertalot, 1995
- Species Fragilaria germainii E.Reichardt & Lange-Bertalot, 1990
- Species Fragilaria gessneri Hustedt, 1956
- Species Fragilaria gibba Ehrenberg, 1837
- Species Fragilaria gieskesii Cholnoky, 1963
- Species Fragilaria gigantea Lauby, 1910
- Species Fragilaria glabra Ehrenberg, 1843
- Species Fragilaria glacialis Petit, 1908
- Species Fragilaria glans (Ehrenberg) Ehrenberg accepted as Navicula glans Ehrenberg, 1838
- Species Fragilaria glebula M.H.Hohn & J.Hellerman, 1963
- Species Fragilaria gloiophila (Grunow) Van de Vijver, Ector, T.M.Schuster & J.Walter, 2020
- Species Fragilaria gnathastoma M.H.Hohn, 1961
- Species Fragilaria goeyersiana Van de Vijver & Ector, 2020
- Species Fragilaria gracilis Østrup, 1910
- Species Fragilaria gracillima Mayer
- Species Fragilaria gracillima auct. non Mayer
- Species Fragilaria grandis Ehrenberg, 1838
- Species Fragilaria granulata Karsten, 1907
- Species Fragilaria granulata Ehrenberg, 1844
- Species Fragilaria gregoryana (Grunow) H.L. Smith, 1884
- Species Fragilaria groenlandica Meunier, 1910
- Species Fragilaria grunowii H.Lange-Bertalot & S.Ulrich, 2014
- Species Fragilaria grunowii (Pantocsek) F.W. Mills, 1934 accepted as Staurosira grunowii var. grunowii Pantocsek, 1892
- Species Fragilaria guenter-grassii Witkowski & Lange-Bertalot, 1993 accepted as Staurosirella guenter-grassii (Witkowski & Lange-Bert.) E.Morales, C.E.Wetzel & Ector, 2019
- Species Fragilaria gustavei Héribaud, 1903
- Species Fragilaria hainanensis Zhang & Qi, 1994
- Species Fragilaria hantzschiana Gerstenberger in litt. Rabenhorst, 1861
- Species Fragilaria harrisonii (W.Smith) Grunow, 1862 accepted as Staurosirella leptostauron (Ehrenberg) D.M.Williams & Round, 1987
- Species Fragilaria harrissonii W.Smith
- Species Fragilaria heatherae Kahlert & M. G. Kelly, 2019
- Species Fragilaria heideni Østrup
- Species Fragilaria heidenii Østrup, 1910 accepted as Staurosira inflata (Heiden) A.Rusanov, Ács, E. Morales & Ector in Rusanov et al., 2018
- Species Fragilaria henryi H. Lange-Bertalot apud H. Lange-Bertalot & S.I. Genkal, 1999
- Species Fragilaria heudreana Van de Vijver, C.E.Wetzel et Ector in Van de Vijver et al., 2022
- Species Fragilaria hidasensis Hajós, 1973
- Species Fragilaria hiemalis (Roth) Lyngbye, 1819
- Species Fragilaria hiemalis sensu Duby, 1830
- Species Fragilaria himalayae Ehrenberg, 1854
- Species Fragilaria hinganensis Skvortzov
- Species Fragilaria hirosakiensis Kanaya, 1959
- Species Fragilaria hoelii Foged, 1964
- Species Fragilaria huebeneri A.Schwarz, K.J.Krahn et C.E.Wetzel in Krahn et al., 2021
- Species Fragilaria huerlimannii Van de Vijver in Van de Vijver et al., 2022
- Species Fragilaria hungarica Pantocsek
- Species Fragilaria hungeriana Grunow
- Species Fragilaria husvikensis Van de Vijver, Denys & Beyens
- Species Fragilaria hyalina (Kützing) Grunow ex Van Heurck, 1880
- Species Fragilaria hyemalis Agardh
- Species Fragilaria hyemalis Kützing
- Species Fragilaria hyemalis Lyngbye
- Species Fragilaria hyemalis Ralfs, 1843
- Species Fragilaria hyemalis (Roth) Lyngbye, 1819
- Species Fragilaria imbramoviciana Kaczmarska, 1976
- Species Fragilaria improbula Witkowski & Lange-Bertalot, 1995
- Species Fragilaria incisa (C.S.Boyer) Lange-Bertalot, 1980 accepted as Synedra incisa Boyer, 1920
- Species Fragilaria incognita Reichardt, 1988
- Species Fragilaria indigema Skvortzov, 1976
- Species Fragilaria inflata Pantocsek, 1902
- Species Fragilaria inflata (Heiden) Hustedt, 1931
- Species Fragilaria inflatissima Hustedt, 1952
- Species Fragilaria inflexa Ehrenberg, 1870
- Species Fragilaria informa W. Smith
- Species Fragilaria intermedia (Grunow) Grunow in Van Heurck, 1881
- Species Fragilaria intermedia Grunow, 1881 accepted as Fragilaria capucina var. vaucheriae (Kützing) Lange-Bertalot, 1980
- Species Fragilaria interstincta M.H.Hohn & J.Hellerman, 1963
- Species Fragilaria investiens (W. Smith) Cleve-Euler, 1953 accepted as Tabularia investiens (W.Smith) D.M.Williams & F.E.Round, 1986
- Species Fragilaria ischaboensis Grunow in Van Heurck, 1881
- Species Fragilaria islandica Grunow ex Van Heurck, 1881
- Species Fragilaria istvanffyi Pantocsek, 1902
- Species Fragilaria japonica Pantocsek, 1892
- Species Fragilaria japonica Meister, 1937
- Species Fragilaria javanica Hustedt, 1938
- Species Fragilaria joachimii Kahlert, 2019
- Species Fragilaria juergensii (Agardh) Kützing, 1833 (1834)
- Species Fragilaria kamica Loseva, 1982
- Species Fragilaria karelica Mölder, 1951 accepted as Aulacoseira karelica (Mölder) Simonsen, 1979
- Species Fragilaria karstenii Boden, 1950
- Species Fragilaria kavnensis (Pantocsek) De Toni, 1892 accepted as Staurosira kavnensis Pantocsek, 1889
- Species Fragilaria kerguelensis (O'Meara) Cleve, 1901 accepted as Terebraria kerguelensis E.O'Meara, 1876 †
- Species Fragilaria kizakensis Skvortzow & Noda, 1971
- Species Fragilaria kochii Pantocsek, 1892
- Species Fragilaria kriegeriana Krasske, 1943
- Species Fragilaria labei Witkowski & Metzeltin, 1996
- Species Fragilaria lacusbaikalii Skvortzow, 1937
- Species Fragilaria laevigata (Grunow) Lange-Bertalot, 1980 accepted as Synedra laevigata f. laevigata Grunow, 1877
- Species Fragilaria laevis Ehrenberg, 1843 †
- Species Fragilaria laevis Corda, 1840
- Species Fragilaria laevissima Cleve, 1898
- Species Fragilaria laevissima Meister, 1937
- Species Fragilaria lagerheimii
- Species Fragilaria lamella Ehrenberg, 1854
- Species Fragilaria lanceolata (Kützing) E.Reichardt, 1988 accepted as Synedra lanceolata f. lanceolata Kützing, 1844
- Species Fragilaria lancettula Schumann, 1867
- Species Fragilaria lapponica Grunow, 1881 accepted as Staurosirella lapponica (Grunow) D.M.Williams & Round, 1987
- Species Fragilaria lata (Cleve-Euler) Renberg, 1977 accepted as Synedra parasitica f. lata Cleve-Euler, 1953
- Species Fragilaria latiscula Lyngbye, 1819
- Species Fragilaria latruncularia Lyngbye, 1819
- Species Fragilaria legumen Ehrenberg, 1854
- Species Fragilaria lenoblei E.E.Manguin
- Species Fragilaria lenticularis M. Peragallo, 1920
- Species Fragilaria lenzii (Krasske) Lange-Bertalot & Willmann apud Lange-Bertalot et al., 1996
- Species Fragilaria leptartha Corda, 1840
- Species Fragilaria leptocephala Ehrenberg, 1853
- Species Fragilaria leptoceros Ehrenberg, 1844
- Species Fragilaria leptostauron (Ehrenberg) Hustedt, 1931 accepted as Staurosirella leptostauron (Ehrenberg) D.M.Williams & Round, 1987
- Species Fragilaria levis Ehrenberg, 1843
- Species Fragilaria limnetica Alexson & Reavie in Alexson et al., 2022
- Species Fragilaria linearis Castracane, 1886 accepted as Fragilariopsis linearis (Castracane) Frenguelli, 1943
- Species Fragilaria lineata (L.W.Dillwyn) H.C.Lyngbye
- Species Fragilaria litoralis Cholnoky, 1963
- Species Fragilaria loetscherii Lange-Bertalot in Lange-Bertalot & Le Cohu, 1985
- Species Fragilaria longiceps (Ehrenberg) Lange-Bertalot, 1980 accepted as Synedra longiceps Ehrenberg, 1845
- Species Fragilaria longifusiformis (Hains & Sebring) Siver et al.
- Species Fragilaria longirostris Frenguelli, 1941 accepted as Staurosira longirostris (Frenguelli) Metzeltin, Lange-Bertalot & García-Rodríguez
- Species Fragilaria longissima Hustedt, 1913
- Species Fragilaria luciae Cholnoky, 1968
- Species Fragilaria luteolus Corda, 1840
- Species Fragilaria maarensis K.J.Krahn et C.E.Wetzel in Krahn et al., 2021
- Species Fragilaria maeotica Milovanova, 1955
- Species Fragilaria magocsyi Lacsny, 1916
- Species Fragilaria maillardii Le Cohu in Lange-Bertalot & Le Cohu, 1985
- Species Fragilaria margarethae Schoeman, 1970
- Species Fragilaria marina
- Species Fragilaria martyi (Héribaud-Joseph) Lange-Bertalot, 1993 accepted as Opephora martyi f. martyi Héribaud, 1902
- Species Fragilaria maxima O'Meara, 1876
- Species Fragilaria mazamaensis (Sovereign) Lange-Bertalot, 1980 accepted as Synedra mazamaensis Sovereign, 1958
- Species Fragilaria mecsekia Hajós, 1973
- Species Fragilaria mediterranea
- Species Fragilaria meisteri VanLandingham, 1971
- Species Fragilaria mertensiana Van de Vijver, C.E.Wetzel et Ector in Va de Vijver et al., 2022
- Species Fragilaria mesodon Ehrenberg, 1839
- Species Fragilaria mesogongyla Ehrenberg, 1856
- Species Fragilaria mesolepta Rabenhorst, 1861
- Species Fragilaria mesotyla Ehrenberg, 1847
- Species Fragilaria metcalfeana Van de Vijver, D.M.Williams, Kusber et T.M.Schuster in Van de Vijver et al., 2022
- Species Fragilaria mexicana (Ehrenberg) De Toni, 1892 accepted as Staurosira mexicana Ehrenberg, 1854
- Species Fragilaria michiganensis Alexson, Reavie & Van de Vijver in Alexson et al., 2022
- Species Fragilaria micra Z.Levkov & D.M.Williams, 2011
- Species Fragilaria microcephala (Neupauer) Pantocsek, 1889
- Species Fragilaria microcephala R.F.Bastow, 1960
- Species Fragilaria microrhombus Cholnoky, 1970 accepted as Navicula microrhombus (Cholnoky) Schoeman & Archibald, 1977
- Species Fragilaria microstriata Marciniak, 1982
- Species Fragilaria minima (Ralfs) Grunow, 1862 accepted as Diatoma minimum Ralfs, 1846
- Species Fragilaria miniscula (Grunow) D.M.Williams & Round, 1987
- Species Fragilaria minuta Pantocsek, 1889
- Species Fragilaria minutissima Grunow in Van Heurck, 1881
- Species Fragilaria miocenica Z.Jousé
- Species Fragilaria misarelensis Almeida, C.Delgado, Novais & S. Blanco in Novais et al., 2019
- Species Fragilaria moissacensis Héribaud, 1908
- Species Fragilaria mollis Meunier, 1910
- Species Fragilaria montana (Krasske) Lange-Bertalot, 1980 accepted as Synedra montana f. montana Krasske ex Hustedt, 1932
- Species Fragilaria mormonorum (Grunow) Boyer, 1927 accepted as Fragilaria brevistriata var. mormorum Grunow in Van Heurck, 1881
- Species Fragilaria moronensis (Truan in Tempère & Peragallo)
- Species Fragilaria mujltipunctata (Ehrenberg) Ehrenberg, 1830 accepted as Bacillaria multipunctata Ehrenberg in Hemprich & Ehrenberg, 1828
- Species Fragilaria mujltipunctata (Hemprich & Ehrenberg) Ehrenberg, 1832 accepted as Bacillaria multipunctata Ehrenberg in Hemprich & Ehrenberg, 1828
- Species Fragilaria multipunctata Hemprich & Ehrenberg
- Species Fragilaria mutabilis (W.Smith) Grunow, 1862 accepted as Staurosirella pinnata var. intercedens (Grunow) P.B.Hamilton, 1994
- Species Fragilaria nana (Meister) Lange-Bertalot, 1980 accepted as Synedra nana f. nana Meister, 1912
- Species Fragilaria nana Steemann Nielsen, 1935
- Species Fragilaria nanana Lange-Bertalot, 1993
- Species Fragilaria nankoorensis Grunow, 1868
- Species Fragilaria nanoides Lange-Bertalot, 1996
- Species Fragilaria navicula Ehrenberg, 1840
- Species Fragilaria neglecta Van de Vijver, C.E.Wetzel, Jarlman et Ector in Van de Vijver et al., 2022
- Species Fragilaria neobacillum VanLandingham, 1971
- Species Fragilaria neoelliptica A.Witkowski, 1994
- Species Fragilaria neogena Pantocsek, 1913
- Species Fragilaria neointermedia Tuji et D.M.Williams
- Species Fragilaria neoproducta Lange-Bertalot, 1991
- Species Fragilaria neotropica P.D.Almeida, E.Morales & C.E.Wetzel in Almeida et al., 2016
- Species Fragilaria nevadensis J.E.Linares-Cuesta & P.M.Sánchez-Castillo, 2007
- Species Fragilaria nevadensis K.E. Lohman, 1957
- Species Fragilaria newberryi Ehrenberg, 1870
- Species Fragilaria nitida Héribaud-Joseph
- Species Fragilaria nitzschioides Grunow, 1881 accepted as
- Species Fragilaria nodosa Cleve, 1898
- Species Fragilaria nodulosa Ehrenberg, 1844 (1845)
- Species Fragilaria norma Smayda, 1966
- Species Fragilaria northumbrica Grunow in Van Heurck, 1881
- Species Fragilaria nummuloides (Dillwyn) Lyngbye, 1819
- Species Fragilaria oamaruensis Schrader, 1969
- Species Fragilaria obliquecostata van Heurck, 1909 accepted as Fragilariopsis obliquecostata (van Heurck) Heiden, 1928
- Species Fragilaria oblonga Drebes & Schulz, 1990
- Species Fragilaria oblongata Drebes & Schultz
- Species Fragilaria obtusa Hustedt, 1956
- Species Fragilaria oceanica Cleve, 1873 accepted as Fragilariopsis oceanica (Cleve) Hasle, 1965
- Species Fragilaria odeloucaensis E.Morales, Novais, C.E.Wetzel, Ector & Morais, 2022
- Species Fragilaria oldenburgiana Hustedt, 1959
- Species Fragilaria oldenburgioides Lange-Bertalot, 1996 accepted as Staurosirella oldenburgioides (Lange-Bertalot in Lange-Bertalot & Metzeltin) E.Morales, M.L.García & Maidana, 2017
- Species Fragilaria opacolineata Lange-Bertalot, 1996 accepted as Pseudostaurosira opacolineata (Lange-Bertalot in Lange-Bertalot & Metzeltin) M.L.García & Maidana, 2017
- Species Fragilaria opephoroides Takano, 1988 accepted as Serratifera opephoroides (Takano) Chunlian Li & Witkowski, 2018
- Species Fragilaria ostenfeldii (Willi Krieg.) Van de Vijver, Alexson & Reavie in Van de Vijver et al., 2020
- Species Fragilaria ovalis Hajós, 1959
- Species Fragilaria ovata M. Peragallo, 1903
- Species Fragilaria oxyptera Ehrenberg, 1856
- Species Fragilaria oxyrhombus Ehrenberg, 1856
- Species Fragilaria pacifica Grunow, 1862 accepted as Opephora pacifica (Grunow) Petit, 1888
- Species Fragilaria pannonica Pantocsek, 1913
- Species Fragilaria pantocsekii Cleve-Euler, 1953
- Species Fragilaria paradoxa Ehrenberg, 1841
- Species Fragilaria pararumpens Lange-Bertalot, G. Hofmann & Werum, 2013
- Species Fragilaria parasitica (W.Smith) Grunow, 1881 accepted as Pseudostaurosira parasitica (W.Smith) Morales, 2003
- Species Fragilaria parasitica (W.Smith) Heiberg, 1863 accepted as Odontidium parasiticum var. parasiticum W. Smith, 1856
- Species Fragilaria parva (Grunow) A.Tuji & D.M.Williams, 2008
- Species Fragilaria patagonica (Cleve) De Toni, 1892
- Species Fragilaria pavini Manguin, 1954
- Species Fragilaria pecten Castracane, 1882
- Species Fragilaria pectinalis (O.F.Müller) Lyngbye, 1819
- Species Fragilaria pectinalis Agardh
- Species Fragilaria pectinalis auct. non Lyngbye
- Species Fragilaria pectinalis Ehrenberg, 1838
- Species Fragilaria pectinata Ehrenberg
- Species Fragilaria pediculata Proschkina-Lavrenko, 1962
- Species Fragilaria pelagica Ehrenberg, 1872
- Species Fragilaria pellucida Lohman & Andrews, 1968
- Species Fragilaria pelta Hohn & Hellerman, 1966
- Species Fragilaria pennsylvanica E.A.Morales, 2003
- Species Fragilaria peragalli Frenguelli, 1926-1928
- Species Fragilaria peragalloi Pantocsek, 1892
- Species Fragilaria perdelicatissima Lange-Bertalot & Van de Vijver in Lange-Bertalot & Ulrich, 2014
- Species Fragilaria perminuta (Grunow in Van Heurck) Lange-Bertalot in Krammer & Lange-Bertalot, 2000
- Species Fragilaria phantasma (M.H.Hohn) C.E.Wetzel, Potapova & D.M.Williams, 2022
- Species Fragilaria pinnata Ehrenberg, 1843
- Species Fragilaria pinnatoides B.J.Cholnoky, 1960
- Species Fragilaria pinnulata Ehrenberg, 1844
- Species Fragilaria planctonica H.Heiden
- Species Fragilaria pliocena J.-J.Brun
- Species Fragilaria polonica M.Witak & Lange-Bertalot, 1995
- Species Fragilaria polyedra Ehrenberg, 1854
- Species Fragilaria polygonata Cleve-Euler, 1953 accepted as Fragilariforma polygonata (Cleve-Euler) Kingston, Sherwood & Bengtsson
- Species Fragilaria pomerooni Ehrenberg, 1854
- Species Fragilaria praechankensis Jousé, 1952
- Species Fragilaria praeleptostauron Hajós, 1973
- Species Fragilaria producta (Lagerstedt) Grunow, 1881 accepted as Fragilariforma virescens (Ralfs) D.M.Williams & Round, 1988
- Species Fragilaria prolongata (Grunow) Van de Vijver, C.E.Wetzel, Kusber & Ector, 2020
- Species Fragilaria pseudoatomus Manguin, 1960
- Species Fragilaria pseudoconstruens Marciniak, 1982
- Species Fragilaria pseudocylindrus Manguin ex Kociolek & Reviers, 1996
- Species Fragilaria pseudofamiliaris Van de Vijver, T.M.Schuster, Kusber et D.M.Williams in Van de Vijver et al., 2022
- Species Fragilaria pseudogaillonii Kobayasi & Idei, 1979
- Species Fragilaria pseudolaevissima VanLandingham, 1971
- Species Fragilaria pseudolanceolata Pantocsek, 1913
- Species Fragilaria pseudomesolepta Poretzky ex Proschkina-Lavrenko, 1950
- Species Fragilaria pseudomesolepta Poretzky, 1953
- Species Fragilaria pteridium Ehrenberg, 1854
- Species Fragilaria pulchella (Ralfs ex Kützing) Lange-Bertalot, 1980 accepted as Exilaria pulchella Ralfs ex Kützing, 1844
- Species Fragilaria punctata John, 1981
- Species Fragilaria punctatostriata Manguin, 1942
- Species Fragilaria punctifomis A. Witkowski & D. Metzeltin apud D. Metzeltin & A. Witkowski, 1996
- Species Fragilaria pusilla Kützing, 1849
- Species Fragilaria quadrata (Hustedt) Lange-Bertalot & Metzeltin, 1996 accepted as Fragilaria undata var. quadrata Hustedt, 1930
- Species Fragilaria quebecensis (Poulin, Hudon & Cardinal) A.Witkowski, H.Lange-Bertalot & D.Metzeltin, 2000
- Species Fragilaria radians (Kützing) D.M.Williams & Round, 1987
- Species Fragilaria recapitellata H. Lange-Bertalot & D. Metzeltin, 2009
- Species Fragilaria reicheltii (Voigt) Lange-Bertalot, 1986 accepted as Centronella reichelti Voigt, 1902
- Species Fragilaria rhabdosoma Ehrenberg, 1832
- Species Fragilaria rhodana M.H.Hohn & J.Hellerman, 1963
- Species Fragilaria rhombica (O'Meara) Heiden & Kolbe, 1928 accepted as Diatoma rhombicum O'Meara, 1876
- Species Fragilaria rhombica Cleve, 1901
- Species Fragilaria rhombica Østrup, 1918 (1920)
- Species Fragilaria rhombus Ehrenberg, 1854
- Species Fragilaria riesgoviensis Schauderna, 1983
- Species Fragilaria rinoi Almeida & C.Delgado, 2016
- Species Fragilaria robusta (Fusey) Manguin, 1954 accepted as Fragilaria construens f. robusta Fusey, 1951
- Species Fragilaria robusta Hustedt ex Simonsen, 1987
- Species Fragilaria rockefellerii Pantocsek, 1909
- Species Fragilaria rolandschmidtii Metzeltin & Lange-Bertalot, 1998
- Species Fragilaria rostrata Pantocsek, 1912
- Species Fragilaria rotunda Hajós, 1959
- Species Fragilaria rotunda Hajós & Palfalvy, 1961
- Species Fragilaria rotundata Ehrenberg, 1844
- Species Fragilaria rotundissima Hargraves & Guillard, 1974
- Species Fragilaria rumpens (Kützing) G.W.F.Carlson, 1913
- Species Fragilaria salina Kützing, 1833
- Species Fragilaria salvadoriana K.J.Krahn et C.E.Wetzel in Krahn et al., 2021
- Species Fragilaria sandellii Van de Vijver & Jarlman in Van de Vijver et al., 2012
- Species Fragilaria santaremensis Metzeltin & Lange-Bertalot, 1998
- Species Fragilaria saxoplanctonica H.Lange-Bertalot & S.Ulrich, 2014
- Species Fragilaria scalaris Ehrenberg, 1838
- Species Fragilaria schulzii C.Brockmann, 1950
- Species Fragilaria schwartziana Grunow, 1868
- Species Fragilaria schwartzii Grunow, 1863
- Species Fragilaria scotica (Grunow) Van de Vijver, C.E.Wetzel et Ector in Van de Vijver et al., 2022
- Species Fragilaria seminuda Ehrenberg
- Species Fragilaria seminulum Ehrenberg, 1843
- Species Fragilaria semseyana Pantocsek
- Species Fragilaria sepes Ehrenberg, 1854
- Species Fragilaria sepulta Pantocsek, 1892
- Species Fragilaria shandongensis Li, 1982
- Species Fragilaria shiloi J.J.Lee, Reimer & McEnery, 1980
- Species Fragilaria siamensis Østrup, 1902
- Species Fragilaria sigmoidea Swirenko, 1941 accepted as Nitzschia sigmoidea (Nitzsch) W.Smith, 1853
- Species Fragilaria silendum Hohn & Hellerman, 1966 accepted as Neodelphineis silenda (Hohn & Hellerman, 1966) Desianti & Potapova, 2015
- Species Fragilaria similis Krasske, 1939
- Species Fragilaria sinuata M.Peragallo, 1909
- Species Fragilaria siolii Hustedt, 1952
- Species Fragilaria skvorzowii Jousé, 1952
- Species Fragilaria smithiana Grunow, 1881
- Species Fragilaria socia (Wallace) Lange-Bertalot, 1980 accepted as Synedra socia Wallace, 1955
- Species Fragilaria somalica G. Frenguelli, 1933
- Species Fragilaria sopotensis Witkowski & Lange-Bertalot, 1993 accepted as Nanofrustulum sopotensis (Witkowski & Lange-Bert.) E.Morales, C.E.Wetzel & Ector, 2019
- Species Fragilaria speciosa (Brightwell) Grunow, 1862 accepted as Odontidium speciosum Brightwell, 1859
- Species Fragilaria spectra P.D.Almeida, E.Morales & C.E.Wetzel in Almeida et al., 2016
- Species Fragilaria spicula Mereschkowsky, 1900
- Species Fragilaria spinarum L-B & Metzeltin, 1996
- Species Fragilaria spinaspeciosa Lange-Bertalot & Cantonati in Cantonati et al., 2019
- Species Fragilaria spinosa Skvortzow, 1937
- Species Fragilaria spinulifera Hustedt, 1927
- Species Fragilaria spinulosa Patrick, 1940
- Species Fragilaria stauroneidea Schumann, 1864
- Species Fragilaria stoermeriana Alexson, Reavie & Van de Vijver in Alexson et al., 2022
- Species Fragilaria strangulata (Zanon) Hustedt
- Species Fragilaria striata Ehrenberg, 1832
- Species Fragilaria striatula Lyngbye, 1819
- Species Fragilaria striatula Agardh, 1824
- Species Fragilaria striatula Agardh
- Species Fragilaria striatula Greville, 1833
- Species Fragilaria striolata Ehrenberg, 1839
- Species Fragilaria stylidium Ehrenberg, 1842
- Species Fragilaria stylus Ehrenberg, 1842
- Species Fragilaria subatomus Gasse, 1975
- Species Fragilaria subcapitata Messikommer, 1971
- Species Fragilaria subconstricta Østrup, 1910
- Species Fragilaria sublika M.H.Hohn & J.Hellerman, 1963
- Species Fragilaria sublinearis van Heurck, 1909 accepted as Fragilariopsis obliquecostata (van Heurck) Heiden, 1928
- Species Fragilaria sublineata Hustedt ex Simonsen, 1987
- Species Fragilaria submicroscopica F.R. Schoeman, 1972
- Species Fragilaria suboldenburgiana K.E. Camburn & D.F. Charles, 2000
- Species Fragilaria subsalina (Grunow) Lange-Bertalot, 1993 accepted as Fragilaria virescens f. subsalina Grunow in Van Heurck, 1881
- Species Fragilaria subvulgaris 'Cholnoky' VanLandingham, 1971
- Species Fragilaria sundaysensis Archibald, 1982
- Species Fragilaria Surirella Ehrenberg, 1854
- Species Fragilaria swartzii Grunow, 1863
- Species Fragilaria synedra Ehrenberg, 1854
- Species Fragilaria synegrotesca Lange-Bertalot, 1993
- Species Fragilaria syriaca Ehrenberg, 1840
- Species Fragilaria tabellaria (O'Meara) De Toni, 1892 accepted as Ralfsia tabellaria O'Meara, 1875
- Species Fragilaria tabulata (C.Agardh) Lange-Bertalot, 1981 accepted as Tabularia tabulata (C.Agardh) Snoeijs, 1992
- Species Fragilaria tabulatoides Cholnoky, 1966
- Species Fragilaria taenia Ehrenberg, 1848
- Species Fragilaria taeniaeformis (J. E. Smith) Gray, 1821
- Species Fragilaria taiaensis Carter & Denny, 1982
- Species Fragilaria telum Carter & Denny, 1987
- Species Fragilaria tenera (W.Smith) Lange-Bertalot, 1980
- Species Fragilaria tenerrima Heiberg, 1863
- Species Fragilaria tenuicollis Heib., 1863
- Species Fragilaria tenuis Agardh, 1832
- Species Fragilaria tenuis Jurilj, 1957
- Species Fragilaria tenuissima H.Lange-Bertalot & S.Ulrich, 2014
- Species Fragilaria tenuistriata Østrup, 1910
- Species Fragilaria teritaria Pantocsek, 1909
- Species Fragilaria tessella Ehrenberg, 1854
- Species Fragilaria thermalis Ehrenberg, 1854
- Species Fragilaria thornata L. Tan & B.H. Kim,
- Species Fragilaria thornata L.Tan & B.H.Kim in Tan et al., 2020
- Species Fragilaria toxoneides (Castracane) Lange-Bertalot, 1980 accepted as Synedra toxoneides var. toxoneides Castracane, 1880
- Species Fragilaria trachea Ehrenberg, 1854
- Species Fragilaria transylvanica Pantocsek, 1892
- Species Fragilaria triangulata Moissejeva in Scheschukova-Poretskaya & Moissejewa, 1964
- Species Fragilaria tricarinata (Ehrenberg) De Toni, 1892 accepted as Staurosira tricarinata Ehrenberg, 1854
- Species Fragilaria triconfusa VanLandingham, 1971
- Species Fragilaria tridentina Cantonati & Lange-Bertalot, 2019
- Species Fragilaria trigibba Pantocsek, 1902
- Species Fragilaria trigongyla (Ehrenberg) De Toni, 1892 accepted as Staurosira trigongyla Ehrenberg, 1843
- Species Fragilaria trinodis Ehrenberg, 1838
- Species Fragilaria triundulata E.V.Østrup
- Species Fragilaria triundulata Saveljewa-Dolgova, 1925
- Species Fragilaria turgens Ehrenberg, 1846
- Species Fragilaria turgidula Ehrenberg, 1831
- Species Fragilaria uliginosa Kulikovskiy, Lange-Bertalot, Witkowski & Dorofeyuk in Kulikovskiy et al., 2010
- Species Fragilaria ulna (Nitzsch) Lange-Bertalot, 1980 accepted as Bacillaria ulna Nitzsch, 1817
- Species Fragilaria undata W.Smith, 1855 accepted as Fragilaria constricta f. stricta (A.Cleve) Hustedt, 1931
- Species Fragilaria undata auct. non W. Smith
- Species Fragilaria undulata Cramer, 1863
- Species Fragilaria undulata Corda, 1835
- Species Fragilaria undulata Ehrenberg, 1854
- Species Fragilaria ungeriana Grunow accepted as Ulnaria ungeriana (Grunow) P.Compère, 2001
- Species Fragilaria unipunctata Lyngbye, 1819
- Species Fragilaria utermoehlii (Hustedt) Lange-Bertalot, 1991 accepted as Synedra utermoehlii Hustedt, 1932
- Species Fragilaria vandevondeliana Van de Vijver & Ector, 2020
- Species Fragilaria vanheurckii Peragallo, 1921
- Species Fragilaria vasta (Pantocsek) F.W. Mills, 1934 accepted as Staurosira vasta Pantocsek, 1892
- Species Fragilaria vaucheriae (Kützing) J.B.Petersen, 1938 accepted as Fragilaria capucina var. vaucheriae (Kützing) Lange-Bertalot, 1980
- Species Fragilaria vaucheriaeraetica Cantonati & Lange-Bertalot
- Species Fragilaria venetiana Cholnoky, 1961
- Species Fragilaria venter Ehrenberg, 1854 accepted as Staurosira venter (Ehrenberg) Cleve & Moeller, 1879
- Species Fragilaria ventralis Ehrenberg, 1854
- Species Fragilaria ventricosa Ehrenberg, 1854
- Species Fragilaria ventriculus Ehrenberg, 1843
- Species Fragilaria viereckiana G. Moser, 1999 accepted as Staurosira viereckiana (Gerd Moser) C.E.Wetzel & E.Morales, 2019
- Species Fragilaria vinaninkarenae Manguin, 1949
- Species Fragilaria virescens Ralfs, 1843 accepted as Fragilariforma virescens (Ralfs) D.M.Williams & Round, 1988
- Species Fragilaria virescens (Grunow) Skabichevskii, 1960 accepted as Fragilaria virescens f. subsalina Grunow in Van Heurck, 1881
- Species Fragilaria vitrea (Kützing) Grunow, 1878
- Species Fragilaria voeringia Fenner in Schrader & Fenner, 1976
- Species Fragilaria vulgaris Ehrenberg, 1845
- Species Fragilaria woerthensis Mayer, 1931
- Species Fragilaria zafarii Sarode & Kamat, 1984
- Species Fragilaria zasuminensis Cabejszekówna, 1937
- Species Fragilaria zeilleri Héribaud-Joseph, 1903
- Species Fragilaria zusaminensis
- Genus Fragilariforma D.M. Williams & F.E. Round, 1988 (8)
- Genus Frankophila H. Lange-Bertalot, 1997 (3)
- Genus Gedaniella Chunlian Li, Witkowski & Ashworth, 2018 (4)
- Genus Grammonema C.A. Agardh, 1832 (2)
- Genus Hannaea R. Patrick in R. Patrick & C.W. Reimer, 1966 (15)
- Genus Hendeyella Ashworth, Witkowski & Chunlian Li, 2016 (4)
- Genus Hyaloneis M.C. Amspoker, 2008
- Genus Hyalosynedra D.M. Williams & F.E. Round, 1986 (7)
- Genus Koernerella C.S. Lobban & E.C. Theriot in Lobban et al., 2011
- Genus Martyana F.E. Round in F.E. Round, R.M. Crawford & D.G. Mann, 1990
- Genus Meridion C.A. Agardh, 1824 (3)
- Genus Neofragilaria D.M. Williams & F.E. Round, 1988 accepted as Fragilariforma D.M. Williams & F.E. Round, 1988
- Genus Neosynedra D.M. Williams & F.E. Round, 1986
- Genus Opephora P. Petit, 1888 (6)
- Genus Perideraion C.S. Lobban & R.W. Jordan in Lobban et al., 2011
- Genus Plagiostriata S.Sato & L.K.Medlin, 2009 (2)
- Genus Podocystis J.W. Bailey, 1854 (1)
- Genus Popovskayella Kulikovskiy & Lange-Bertalot, 2015
- Genus Porannulus P.B. Hamilton & M. Poulin in Hamilton, Poulin, Yang & Kloser, 1998
- Genus Psammosynedra F.E. Round, 1993
- Genus Psammotaenia Ashworth, Chunlian Li & Witkowski, 2016 (1)
- Genus Pseudo-eunotia A. Grunow in H. Van Heurck, 1881 (1)
- Genus Pseudofalcula F. Gomez, Lu Wang & Senjie Lin, 2018 (1)
- Genus Pseudostaurosira D.M. Williams & F.E. Round, 1988 (59)
- Genus Pteroncola R.W. Holmes & D.A. Croll, 1984 (1)
- Genus Punctastriata D.M. Williams & F.E. Round, 1988 (4)
- Genus Reimerothrix A.K.S.K. Prasad in Prasad, A.K. S.K., Nienow, J.A. & Riddle, K.A., 2001
- Genus Rimoneis M. Garcia, 2010
- Genus Sarcophagodes E.A. Morales, 2002 (5)
- Genus Serratifera Ashworth, Chunlian Li & Witkowski, 2016 (2)
- Genus Stauroforma R.J. Flower, V.J. Jones & F.E. Round, 1996 (1)
- Genus Staurosira C.G. Ehrenberg, 1843 (16)
- Genus Staurosirella D.M. Williams & F.E. Round, 1987 (26)
- Genus Synedra C.G. Ehrenberg, 1830 (35)
- Genus Synedrella F.E. Round & N.I. Maidana, 2001 accepted as Pseudostaurosira D.M. Williams & F.E. Round, 1988
- Genus Synedropsis G.R.Hasle, L.K.Medlin & E.E.Syvertsen, 1994 (1)
- Genus Tabularia (F.T. Kutzing) D.M. Williams & F.E. Round, 1986 (18)
- Genus Tabularia F.T. Kutzing, 1844
- Genus Tabulariopsis D.M.Williams, 1988
- Genus Thalassioneis F.E. Round in F.E. Round, R.M. Crawford & D.G. Mann, 1990
- Genus Tibetiella Y.L.Li, D.M.Williams & D.Metzeltin, 2010 (1)
- Genus Trachysphenia P. Petit in Folin & Perrier, 1877 (1)
- Genus Ulnaria (Kützing) P. Compère, 2001 (15)
- Genus Ulnaria F.T. Kutzing, 1844
- Order Licmophorales (49)
- Order Protoraphidales (1)
- Order Rhabdonematales (3)
- Order Rhaphoneidales
- Order Striatellales (15)
- Order Tabellariales (16)
- Order Thalassionematales (10)
- Order Toxariales (1)
- Order Centrales
