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)
- Superorder Bacillariophycanae (4 083)
- Order Achnanthales (438)
- Order Bacillariales (357)
- Order Cymbellales (792)
- Family Anomoeoneidaceae D.G. Mann, 1990 (16)
- Family Cymbellaceae Greville, 1833 (423)
- Family Cymbellales incertae sedis (3)
- Family Gomphonemataceae Kützing, 1844 (320)
- Genus Afrocymbella K. Krammer, 2003 (5)
- Genus Gomphocymbella O.F. Müller, 1905 (1)
- Genus Gomphoneis P.T. Cleve, 1894 (70)
- Genus Gomphonema C.G. Ehrenberg, 1832 (225)
- Species Gomphonema abbreviatum C.Agardh, 1831 accepted as Rhoicosphenia abbreviata (C.Agardh) Lange-Bertalot, 1980
- Species Gomphonema abbreviatum (Agardh) Kützing, 1833
- Species Gomphonema abbreviatum auct. non Agardh
- Species Gomphonema acceptatum Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema accessum Héribaud, 1903
- Species Gomphonema acidoclinatiforme D. Metzeltin & H. Lange-Bertalot, 2002
- Species Gomphonema acidoclinatum Lange-Bertalot & Reichardt, 2004
- Species Gomphonema aciforme Kociolek, Spaulding, Sabbe & Vyverman, 2004
- Species Gomphonema aculeiferum Kociolek & Stoermer, 1990
- Species Gomphonema acuminatum Ehrenberg, 1832
- Species Gomphonema acuminatum sensu Grunow in Van Heurck, 1880
- Species Gomphonema acutiusculum (O.Müll.) A.Cleve, 1955 accepted as Gomphonema lanceolatum var. acutiuscula Otto Müller, 1898
- Species Gomphonema adductum Hustedt, 1965
- Species Gomphonema adhikarii C.Radhakrishnan, Sudipta K.Das, Kociolek et B.Karthick in Radhakrishnan et al., 2020
- Species Gomphonema aequale Gregory, 1856
- Species Gomphonema aequatoriale Hustedt, 1949
- Species Gomphonema aequirostrum Metzeltin & Lange-Bertalot, 1998
- Species Gomphonema aestuarii Cleve, 1893
- Species Gomphonema affine Kützing, 1844
- Species Gomphonema affinopsis D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Gomphonema afrhombicum E.Reichardt, 2007
- Species Gomphonema africanum G.S.West, 1907
- Species Gomphonema agnitum Hustedt, 1965
- Species Gomphonema alaskaensis E.Manguin ex Kociolek & Reviers, 1996
- Species Gomphonema alaskana Patrick & Freese, 1961
- Species Gomphonema alaskensis Manguin ex Kociolek & Reviers, 1996
- Species Gomphonema alavariense C. Delgado, S. Blanco, L. Gonzalez-Paz & S.F.P. Almeida in Gonzalez-Paz et al., 2020
- Species Gomphonema alfinitoanum D. Metzeltin & H. Lange-Bertalot, 2007
- Species Gomphonema alineae Lange-Bertalot & Reichardt in Lange-Bertalot, 1993
- Species Gomphonema amerhombicum E.Reichardt, 2007
- Species Gomphonema americanum Ehrenberg, 1840
- Species Gomphonema americobtusatum E. Reichardt & H. Lange-Bertalot apud E. Reichardt, 1999
- Species Gomphonema amoenum Lange-Bertalot, 1985
- Species Gomphonema ampullaceum Greville, 1833
- Species Gomphonema andinum E.A.Morales & M.L.Vis, 2007
- Species Gomphonema angkoricum Cejudo-Figueiras, S.Blanco & Ãlvarez-Blanco, 2012
- Species Gomphonema anglicum Ehrenberg, 1843
- Species Gomphonema anguina
- Species Gomphonema angulare Rogovskaya, 1936
- Species Gomphonema angusta (Rabenhorst)
- Species Gomphonema angustatum (Kützing) Rabenhorst, 1864
- Species Gomphonema angustatum sensu Brebisson
- Species Gomphonema angusticapitatum Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema angusticephalum E. Reichardt & H. Lange-Bertalot apud E. Reichardt, 1999
- Species Gomphonema angusticlavatum Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema angustissimum F.Hustedt
- Species Gomphonema angustiundulatum Metzeltin, Lange-Bertalot & Nergui, 2009
- Species Gomphonema angustius E.Reichardt, 2009
- Species Gomphonema angustivalva Reichardt, 1997
- Species Gomphonema angustum C.Agardh, 1831
- Species Gomphonema angustum Kützing, 1844
- Species Gomphonema angustum Brebisson fide Grunow in Van Heurck, 1880
- Species Gomphonema anjae Lange-Bertalot & Reichardt
- Species Gomphonema anomalum H.L. Smith, 1860
- Species Gomphonema antarcticum O'Meara, 1876
- Species Gomphonema apicatum Ehrenberg, 1854
- Species Gomphonema apicetrapezon Kufferath, 1956
- Species Gomphonema apiculatum Ehrenberg, 1843
- Species Gomphonema aponina Arnoldi & Alekenko, 1914
- Species Gomphonema appalachianum J.P.Kociolek & E.W.Thomas, 2009
- Species Gomphonema appendiculata (Perty)
- Species Gomphonema appendiculatum Perty, 1852
- Species Gomphonema apuncto Wallace, 1960
- Species Gomphonema archaevibrio Lange-Bertalot & Reichardt in Reichardt, 1995 accepted as Gomphonema archaevibrio f. cuneatum D. Metzeltin & H. Lange-Bertalot, 1998
- Species Gomphonema arcticum Grunow, 1880
- Species Gomphonema argentescens (C.A.Agardh) Kützing
- Species Gomphonema argunensis Skvortzov, 2012
- Species Gomphonema aschersonii (Otto Müller) F.W.Mills, 1934 accepted as Gomphocymbella aschersonii var. aschersonii Otto Müller, 1905
- Species Gomphonema asiaticum Liu & Kociolek, 2013
- Species Gomphonema astridiae H. Lange-Bertalot & S.I. Genkal in H. Lange-Bertalot (ed.), 1999
- Species Gomphonema asymmetricum J.R.Carter, 1966
- Species Gomphonema asymmetricum Gutwinski, 1890
- Species Gomphonema attenuatum Pantocsek, 1909
- Species Gomphonema augur Ehrenberg, 1840
- Species Gomphonema augur auct. non Ehrenberg
- Species Gomphonema auguriforme Levkov, Mitic-Kopanja, Wetzel & Ector in Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema auritum A.Braun ex Kützing, 1849
- Species Gomphonema australiense Grunow ex Cleve & Moller, 1879
- Species Gomphonema bacillare Cleve-Euler, 1955
- Species Gomphonema bacillum Ehrenberg, 1854
- Species Gomphonema baicalense (Skvortzow & Meyer) Proschkina-Lavrenko, 1950
- Species Gomphonema balatonis Pantocsek
- Species Gomphonema balcanicum Z.Levkov & S.Krstic, 2007
- Species Gomphonema balnearum Pantocsek, 1903
- Species Gomphonema balticum Cleve, 1868
- Species Gomphonema barrowiana Patrick & Freese, 1961
- Species Gomphonema batei D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Gomphonema bavaricum Reichardt & Lange-Bertalot, 1991
- Species Gomphonema bella Fricke in Schmidt et al., 1906
- Species Gomphonema bengalense Grunow in Van Heurck, 1880
- Species Gomphonema bereleii
- Species Gomphonema bergeri E.Reichardt, 2007 †
- Species Gomphonema berggreni
- Species Gomphonema berggrenii Cleve
- Species Gomphonema bergii Skvortzov & Meyer
- Species Gomphonema berkeleii
- Species Gomphonema bicapitatum O'Meara, 1876
- Species Gomphonema bicepiformis Wei Zhang & Kociolek, 2018
- Species Gomphonema biceps Meister, 1934 (1935)
- Species Gomphonema biconfusum VanLandingham, 1971
- Species Gomphonema bigutianchnensis Y.Li in Liao & Y.Li, 2018
- Species Gomphonema bipunctata Krasske, 1943
- Species Gomphonema bipunctatum Zimmermann, 1915
- Species Gomphonema biventralis Héribaud & M. Peragallo in Héribaud, 1902
- Species Gomphonema blancheanum Maillard, 1978
- Species Gomphonema blandiculum Kociolek & Stoermer, 1990
- Species Gomphonema bohemicum Reichelt & Fricke, 1902
- Species Gomphonema bohemicum E. Reichardt, 1999
- Species Gomphonema bonapartei Pantocsek, 1909
- Species Gomphonema boreale E.V.Østrup
- Species Gomphonema borealis Kulikovskiy, Kociolek & Solak in Kociolek et al., 2018 accepted as Gomphonema magniaqua M.Kulikovskiy, J.P.Kociolek & Solak in Kociolek & Guiry, 2018
- Species Gomphonema bourbonense Reichardt, 1997
- Species Gomphonema bourrellyi E.Manguin ex Kociolek & Reviers, 1996
- Species Gomphonema bozenae Lange-Bertalot & Reichardt in Lange-Bertalot & Metzeltin, 1996
- Species Gomphonema brachyneurum Otto Müller, 1905
- Species Gomphonema brandisii Gutwinski, 1899
- Species Gomphonema brasiliense Grunow, 1878
- Species Gomphonema brasiliense G. Moser, H. Lange-Bertalot & D. Metzeltin, 1998
- Species Gomphonema brasiliensoide Metzeltin, Lange-Bertalot & García-Rodríguez, 2005
- Species Gomphonema braunii (Grunow)
- Species Gomphonema braziliense Grunow, 1878
- Species Gomphonema brebissonii Kützing, 1849
- Species Gomphonema brebissonii sensu Gregory, 1854
- Species Gomphonema brevipes Kützing, 1833 (1834)
- Species Gomphonema brevistriata Héribaud, 1903
- Species Gomphonema bruni Fricke, 1902
- Species Gomphonema bukycanyona L.N.Bukhtiyarova, 2013
- Species Gomphonema butantana Krasske, 1948
- Species Gomphonema calcareum Cleve, 1868 accepted as Gomphonema olivaceum var. calcareum (Cleve) Van Heurck, 1880
- Species Gomphonema calcifugum H. Lange-Bertalot & E. Reichardt apud H. Lange-Bertalot & S.I. Genkal in H. Lange-Bertalot (ed.), 1999
- Species Gomphonema californicum Stancheva & Kociolek, 2016
- Species Gomphonema camburnii Metzeltin & Lange-Bertalot, 1998
- Species Gomphonema camtschaticum
- Species Gomphonema candelariae Frenguelli, 1924
- Variety Gomphonema candelariae var. candelariae Frenguelli, 1924
- Variety Gomphonema candelariae var. elliptica Frenguelli, 1924
- Variety Gomphonema candelariae var. lanceolata Frenguelli, 1934 †
- Variety Gomphonema candelariae var. minor Frenguelli, 1924
- Species Gomphonema cantalicum J.-J.Brun & Héribaud-Joseph
- Species Gomphonema caperatum Ponader & Potapova, 2017
- Species Gomphonema capitatum Ehrenberg, 1838
- Species Gomphonema capitoccultum Reichardt
- Species Gomphonema capsulare J.A.Ress, E.W.Thomas & Kociolek, 2016
- Species Gomphonema carlsenii Foged, 1964
- Species Gomphonema carolinense Hagelstein, 1939
- Species Gomphonema catarinense Krasske, 1948 accepted as Gomphonema catarinensis G.Krasske, 1948
- Species Gomphonema catarinensis G.Krasske, 1948
- Species Gomphonema catena (Ehrenberg) Rabenhorst, 1864 accepted as Sphenosira catena Ehrenberg, 1843
- Species Gomphonema cathedralis Lange-Bertalot & Reichardt in Lange-Bertalot & Metzeltin, 1996
- Species Gomphonema celatum E.W.Thomas & J.P.Kociolek, 2009
- Species Gomphonema cesatii Chernov, 1949
- Species Gomphonema changyangicum Li, Shi & Lei, 1999
- Species Gomphonema charcotii M.Peragallo
- Species Gomphonema chemeron Jeff.R.Stone, Westover & Kociolek
- Species Gomphonema chinense Liu & Kociolek, 2013
- Species Gomphonema chinense Lemmermann, 1907
- Species Gomphonema cholnokyi S.I.Passy, J.P.Kociolek & R.L.Lowe, 1997
- Species Gomphonema cholnokyites VanLandingham, 1964
- Species Gomphonema christenseni Lowe & Kociolek, 1984
- Species Gomphonema chubichuense I.Jüttner & E.J.Cox, 2000 accepted as Gomphosinica chubichuensis (I.Jüttner & E.J.Cox in Jüttner et al.) Kociolek, You & X.Wang in Kociolek, You, X.Wang & Q.Liu, 2015
- Species Gomphonema citera M.H.Hohn & J.Hellerman, 1963
- Species Gomphonema clarkii
- Species Gomphonema clava E. Reichardt, 2001
- Species Gomphonema clavaeformae Preuss, 1846
- Species Gomphonema clavaherculis (Ehrenberg)
- Species Gomphonema clavatoides H.P.Gandhi, 1960
- Species Gomphonema clavatuloides Rimet, D.G. Mann, Trobajo et N. Abarca in Rimet et al., 2018
- Species Gomphonema clavatulum E.Reichardt, 1999
- Species Gomphonema clavatum Ehrenberg, 1832
- Species Gomphonema clavatum Agardh
- Species Gomphonema clavus L.A.Brébisson, 1835
- Species Gomphonema clerici Frenguelli, 1923
- Species Gomphonema clevei Fricke, 1902
- Species Gomphonema commune Rabenhorst, 1864
- Species Gomphonema commutatum Grunow, 1880 accepted as Gomphonema subclavatum var. commutatum (Grunow) Mayer, 1919
- Species Gomphonema confusum Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema consector Hohn & Hellerman, 1963
- Species Gomphonema constrictum Ehrenberg, 1832 accepted as Gomphonema truncatum Ehrenberg, 1832
- Species Gomphonema constrictum Ehrenberg ex Kützing, 1844
- Species Gomphonema continuum Fricke in Schmidt et al., 1906
- Species Gomphonema contractum Kützing, 1844
- Species Gomphonema contraturris Lange-Bertalot & Reichardt in Lange-Bertalot, 1993
- Species Gomphonema coronatum Ehrenberg, 1840
- Species Gomphonema coronatum auct. non Ehrenberg
- Species Gomphonema correntinum Frenguelli, 1933
- Species Gomphonema corsicum E.Reichardt, 2007
- Species Gomphonema costei Metzeltin & Lange-Bertalot, 1998
- Species Gomphonema costulatum Jasnitsky, 1936
- Species Gomphonema crassestriatum Fritsch & Rich, 1924
- Species Gomphonema crassicingulatum Gerd Moser
- Species Gomphonema crassum Rabenhorst, 1854
- Species Gomphonema cristatum Ralfs, 1843
- Species Gomphonema cristatum sensu H.L. Smith, 1874-1879
- Species Gomphonema crocodilei J.P.Kociolek, S.I.Passy & R.L.Lowe, 1997
- Species Gomphonema crucifera Edsbagge, 1968
- Species Gomphonema cruciferum Frenguelli, 1926
- Species Gomphonema cumrhis M.H.Hohn & J.Hellerman, 1963
- Species Gomphonema cuneatum (Lyngbye) Brébisson, 1838
- Species Gomphonema cuneolus Reichardt, 1997
- Species Gomphonema curtum Hustedt, 1945
- Species Gomphonema curvatum Kützing, 1833 accepted as Rhoicosphenia abbreviata (C.Agardh) Lange-Bertalot, 1980
- Species Gomphonema curvirostrum Tempère & Brun in Brun & Tempère, 1889
- Species Gomphonema cuspidatum G.L.Rabenhorst, 1853
- Species Gomphonema cyclocephalum Torka, 1933
- Species Gomphonema cygnus Ehrenberg, 1843
- Species Gomphonema cygnus sensu Strose, 1884
- Species Gomphonema cymbella Brun, 1891
- Species Gomphonema cymbelliclinum E.Reichardt & Lange-Bertalot, 1999
- Species Gomphonema cymbelloides J.Frenguelli & H.A.Orlando, 1958
- Species Gomphonema dalatica Glushchenko, Kulikovskiy & Kociolek, 2017
- Species Gomphonema danelatum Kisselev, 1931
- Species Gomphonema daphnoides E. Reichardt, 1999
- Species Gomphonema darwinii L.L.Bahls, 2014
- Species Gomphonema delicatula Skvortzov, 1937
- Species Gomphonema demerarae (Grunow) J.Frenguelli, 1941 accepted as Gomphonema brasiliense var. demerarae Grunow, 1878
- Species Gomphonema demersum E.Reichardt, 2009
- Species Gomphonema densistriatum Z.Levkov, 2011
- Species Gomphonema dentata Dorogostaisky, 1904
- Species Gomphonema designatum Reichardt, 1997
- Species Gomphonema dharwarensis H.P.Gandhi, 1956
- Species Gomphonema dichotiforme Z.X.Shi, 2004
- Species Gomphonema dichotomum Kützing, 1833
- Species Gomphonema dichotomum W. Smith
- Species Gomphonema difformum B.Karthick & J.P.Kociolek, 2011
- Species Gomphonema digitatum Kützing, 1844
- Species Gomphonema diminutum B.Karthick & J.P.Kociolek, 2011
- Species Gomphonema dintara Carter & Denny, 1982
- Species Gomphonema dirangense S.K.Das, C.Radhakrishnan, Kociolek & B.Karthick, 2018
- Species Gomphonema discolor Ehrenberg, 1832
- Species Gomphonema dispar Weinhold, 1913
- Species Gomphonema dissymetricum M. Peragallo, 1920
- Species Gomphonema distans (A.Cleve-Euler) Lange-Bertalot & E.Reichardt, 1999
- Species Gomphonema distincte-striatum Kociolek, J. P. & Woodward, J.
- Species Gomphonema dojranense Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema domniciae Guslyakov, 1981
- Species Gomphonema doonense B.Karthick, R.Nautiyal & Kociolek, 2015
- Species Gomphonema drouetii Manguin ex Kociolek & Reviers, 1996
- Species Gomphonema drutelingense E. Reichardt, 1999
- Species Gomphonema dubia Meister, 1932
- Species Gomphonema dubravicense Pantocsek
- Species Gomphonema dulmaae Metzeltin, lange-bertalot & Nergui, 2009
- Species Gomphonema dumbeana Maillard, 1978
- Species Gomphonema duostriatum K.E. Lohman, 1957
- Species Gomphonema duplipunctatum Lange-Bertalot & E.Reichardt, 1996
- Species Gomphonema egregium Skabichevskii, 1984
- Species Gomphonema ehrenbergii Carruthers, 1864
- Species Gomphonema eileencoxiae (Bahls, 2017) Bahls, C.E.Wetzel & Ector, 2018
- Species Gomphonema elegans Grunow, 1880 accepted as Gomphoneis elegans (Grunow) Cleve, 1894 †
- Species Gomphonema elegantissimum E.Reichardt & H.Lange-Bertalot, 2011
- Species Gomphonema ellipsis Metzeltin & Lange-Bertalot, 1998
- Species Gomphonema ellipticum Patrick, 1944
- Species Gomphonema elongatum W.Smith, 1855
- Species Gomphonema eminens Skuja, 1937
- Species Gomphonema entolejum Østrup, 1902
- Species Gomphonema epiphanes Kociolek & Stoermer, 1990
- Species Gomphonema equadorianum Metzeltin & Lange-Bertalot, 1998
- Species Gomphonema eriense Grunow, 1878 accepted as Gomphoneis eriensis (Grunow) Skvortzov & Meyer, 1928
- Species Gomphonema eriensioides Kulikovskiy, Kociolek & Solak in Kociolek et al., 2018
- Species Gomphonema erinaceum (Brébisson & Arnott) Hustedt, 1909 accepted as Peronia erinacea var. erinacea Brébisson & Arnott ex Kitton, 1868
- Species Gomphonema erosum Rabenhorst, 1853
- Species Gomphonema eurycephalus Spaulding & Kociolek, 1998
- Species Gomphonema evanescens Spaulding & Kociolek, 1998
- Species Gomphonema evexus Hohn, 1966
- Species Gomphonema evolutionense L.L.Bahls, 2014
- Species Gomphonema excentricum K.E. Lohman, 1957
- Species Gomphonema exiguum Kützing, 1844 accepted as Gomphoneis exigua (Kützing) Medlin
- Species Gomphonema exiguum (Ostrup) Fricke, 1902
- Species Gomphonema exiguum auct. non Kuetzing, 1880
- Species Gomphonema exilissimum (Grunow) Lange-Bertalot & E.Reichardt, 1996 accepted as Gomphonema parvulum var. exilissima Grunow in Van Heurck, 1880
- Species Gomphonema exscissum Héribaud, 1903
- Species Gomphonema extentum Reichardt & Lange-Bertalot in Reichardt, 1994
- Species Gomphonema fanensis Maillard, 1964
- Species Gomphonema farakulumensis Foged, 1959
- Species Gomphonema fayoumensis Aleem, 1958
- Species Gomphonema fereformosum D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Gomphonema fibula Brébisson ex Kützing, 1849
- Species Gomphonema firma Skvortzov, 1937
- Species Gomphonema flabellatum Kützing, 1833 (1834)
- Species Gomphonema flabellum Chauvin fide Kutzing, 1844
- Species Gomphonema fonticolum (Hustedt) Z. Levkov & S. Krstic in Levkov, Krstic, Metzeltin & Nakov, 2007 accepted as Gomphonema olivaceum var. fonticola Hustedt, 1945
- Species Gomphonema forte Kociolek & Stoermer, 1990
- Species Gomphonema fossile Héribaud, 1908
- Species Gomphonema fractum J.Schumann, 1862
- Species Gomphonema freesei Lowe & Kociolek, 1984
- Species Gomphonema frequentiformis (Metzeltin & Krammer) C.E.Wetzel & F.F.Almeida in Almeida et al., 2020
- Species Gomphonema frickei O.Müller, 1905
- Species Gomphonema frickei Frenguelli, 1923 accepted as Gomphonema frickei O.Müller, 1905
- Species Gomphonema frigidum H. Lange-Bertalot & E. Reichardt apud H. Lange-Bertalot & S.I. Genkal in H. Lange-Bertalot (ed.), 1999
- Species Gomphonema fulgens (Greville) Kützing
- Species Gomphonema fulvum Leiblein
- Species Gomphonema fusticulus W.Smith
- Species Gomphonema fusticulus Gregory, 1855
- Species Gomphonema fusus Fricke in Schmidt et al., 1904
- Species Gomphonema galilae Ehrlich, 1973
- Species Gomphonema gallaudi Héribaud-Joseph
- Species Gomphonema gandhii B.Karthick & J.P.Kociolek, 2011
- Species Gomphonema garciae D. Metzeltin & H. Lange-Bertalot, 2007
- Species Gomphonema gautieri (Van Heurck) H.Lange-Bertalot & D.Metzeltin, 2009 accepted as Gomphonema augur var. gautieri Van Heurck, 1885
- Species Gomphonema gautieriforme D.Mitic-Kopanja, C.E.Wetzel, L.Ector & Z. Levkov, 2014
- Species Gomphonema geisslerae Reichardt & Lange-Bertalot in Reichardt, 1997
- Species Gomphonema geminatum (Lyngbye) C.Agardh, 1824 accepted as Didymosphenia geminata (Lyngbye) M.Schmidt, 1899
- Species Gomphonema geminatum sensu Leiblein, 1830
- Species Gomphonema genestoermeri Liu & Kociolek, 2013
- Species Gomphonema genkalii H. Lange-Bertalot & E. Reichardt apud H. Lange-Bertalot & S. I. Genkal in H. Lange-Bertalot (ed.), 1999
- Species Gomphonema genuinum Arnoldi & Alexenko, 1914
- Species Gomphonema germainii Kociolek & Stoermer, 1990
- Species Gomphonema ghoseii Abdul-Majeed, 1935
- Species Gomphonema gibba J.H.Wallace, 1960
- Species Gomphonema gibberum Hustedt, 1965
- Species Gomphonema giganteum Ehrenberg, 1852
- Species Gomphonema gilloti Héribaud, 1903
- Species Gomphonema glaciale (Kützing) Rabenhorst, 1864 accepted as Sphenella glacialis Kützing, 1844
- Species Gomphonema glans Ehrenberg, 1843
- Species Gomphonema globiferum Meister, 1913
- Species Gomphonema globiferum Ehrenberg, 1854
- Species Gomphonema gomphopleuroides Amossé, 1969
- Species Gomphonema gongylodeum E.W.Thomas & J.P.Kociolek, 2009
- Species Gomphonema gonocephalum Gordienko, 1937
- Species Gomphonema gordejevi Skvortzov, 2012
- Species Gomphonema gracile Ehrenberg, 1838
- Species Gomphonema graciledictum E.Reichardt, 2015
- Species Gomphonema gracillimum Schumann, 1867
- Species Gomphonema graciloides Hustedt, 1965
- Species Gomphonema grande B. Karthick, Kociolek, J.C. Taylor & Cocquyt, 2016
- Species Gomphonema grandicapitatum Skabichevskii, 1984
- Species Gomphonema grangeoni Ehrlich, 1968
- Species Gomphonema granum Edsbagge, 1968
- Species Gomphonema grasmueckii Lange-Bertalot & Reichardt in Lange-Bertalot, 1993
- Species Gomphonema gregarium J.P Kociolek & Jeff Woodward, 2016
- Species Gomphonema groenlandicum E.V.Østrup, 1895 accepted as Pseudogomphonema groenlandicum (Østrup) L.K.Medlin, 1986
- Species Gomphonema grovei M.Schmidt, 1899
- Species Gomphonema grunowii R.M.Patrick & Reimer, 1975
- Species Gomphonema guaraniarum D. Metzeltin & H. Lange-Bertalot, 2007
- Species Gomphonema guettingeri E.Reichardt, 2007 †
- Species Gomphonema haesitans E.Reichardt, 2007
- Species Gomphonema harti Nemoto, 1956
- Species Gomphonema hasta D. Metzeltin & H. Lange-Bertalot, 2002
- Species Gomphonema hasta Skabichevskii, 1976
- Species Gomphonema hastatum (Wislouch) Lange-Bertalot & Reichardt in Lange-Bertalot, 1993 accepted as Gomphonema quadripunctatum f. hastata Wislouch, 1924
- Species Gomphonema hatherlianum R.F.Bastow, 1954
- Species Gomphonema haumani Kufferath, 1934
- Species Gomphonema hawaiiense E.Reichardt, 2005
- Species Gomphonema hebridense W.Gregory, 1854
- Species Gomphonema hedini Hustedt, 1922
- Species Gomphonema hedinii Hustedt, 1922
- Species Gomphonema heideni F.Fricke
- Species Gomphonema heilongtanensis Y.Li, J.P.Kociolek & D.Metzeltin, 2010
- Species Gomphonema helveticum Brun, 1895
- Species Gomphonema herculeanum Ehrenberg, 1845 accepted as Gomphoneis herculeana (Ehrenberg) Cleve, 1894
- Species Gomphonema hercynicum Rabenhorst, 1853
- Species Gomphonema herrmanniana P.Palik, 1961
- Species Gomphonema himalayaense Jüttner in Jüttner et al., 2018
- Species Gomphonema hinganicum Skvortzov, 1976
- Species Gomphonema hinziae Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema holmquistii Foged, 1968
- Species Gomphonema hotchkissii VanLandingham, 1967
- Species Gomphonema hristovskii Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema hubeicum Li, Shi & Lei, 1999
- Species Gomphonema huebeneri D. Metzeltin & H. Lange-Bertalot, 2007
- Species Gomphonema hungaricum Pantocsek, 1892
- Species Gomphonema hustedtii Reichardt
- Species Gomphonema hyalinum Heiberg, 1863
- Species Gomphonema ibericum E.Reichardt, 2007
- Species Gomphonema idsbense Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema ikeda Skvortzow, 1937
- Species Gomphonema imperfecta Manguin, 1964
- Species Gomphonema imprime Kociolek, Spaulding, Sabbe & Vyverman, 2004
- Species Gomphonema inaequilongum (H. Kobayasi) H. Kobayasi in Mayama, S., Idei, M., Osada, K. & T. Nagumo, 2002 accepted as Gomphonema clevei var. inaequilongum H. Kobayashi, 1965
- Species Gomphonema incognitum Reichardt, Jüttner & E.J.Cox
- Species Gomphonema incomperta Manguin, 1949
- Species Gomphonema indistinctum Kociolek, J. P. & Woodward, J.
- Species Gomphonema inflatum Østrup, 1902
- Species Gomphonema inflexum Brébisson in Brébisson & Godey, 1838
- Species Gomphonema innata Skvortzov, 1937
- Species Gomphonema innocens E.Reichardt, 1999
- Species Gomphonema insignaffine E.Reichardt, 2009
- Species Gomphonema insigne Gregory, 1856
- Species Gomphonema insigniforme E. Reichardt & H. Lange-Bertalot apud E. Reichardt, 1999
- Species Gomphonema instabilis Hohn & Hellermann, 1963
- Species Gomphonema insuetum Kociolek in Kociolek et al., 2014
- Species Gomphonema insulare Ehrenberg, 1854
- Species Gomphonema insularum Kociolek, J. P. & Woodward, J.
- Species Gomphonema intermedium Hustedt, 1942
- Species Gomphonema intermedium Grunow
- Species Gomphonema interpositum E.Reichardt, 1999
- Species Gomphonema intricatoides You & Kociolek, 2015
- Species Gomphonema intricatum Kützing, 1844
- Species Gomphonema intricatum Suhr.
- Species Gomphonema intricatum auct. non Kuetzing
- Species Gomphonema inversum Gerd Moser
- Species Gomphonema invidia Carter & Denny, 1982
- Species Gomphonema invisitata Hohn & Hellerman, 1963
- Species Gomphonema irregulare Østrup, 1918 (1920)
- Species Gomphonema irroratum Hustedt, 1945
- Species Gomphonema irtyschicum Cistjakov (Tschistjakov), 1959
- Species Gomphonema isabellae B. van de Vijver, 2006
- Species Gomphonema islandicum Østrup, 1918 (1920)
- Species Gomphonema italicum Kützing, 1844
- Species Gomphonema jablanicense Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema jadwigiae Lange-Bertalot & Reichardt in Lange-Bertalot & Metzeltin, 1996
- Species Gomphonema jahniana Kulikovskiy, Kociolek & Solak in Kociolek et al., 2018
- Species Gomphonema jao Skvortzov, 2012
- Species Gomphonema jasnitskyii (Skvortzov, 2012)
- Species Gomphonema javanicum Hustedt, 1937 (1938)
- Species Gomphonema jeniseyensis Skvortzow, 1971
- Species Gomphonema jergackianum E.Reichardt, 2009
- Species Gomphonema jianghanense Y.L.Li, Z.J.Gong, P.Xie & J.Shen, 2007 †
- Species Gomphonema jianghanensis Li, Gong, Xie & Shen, 2007 †
- Species Gomphonema jilinense Huang in Huang et al., 1983 †
- Species Gomphonema johnsonii L.Bahls, 2013
- Species Gomphonema jordani Ehrenberg, 1854
- Species Gomphonema juettnerii B.Karthick, R.Nautiyal & Kociolek, 2015
- Species Gomphonema juriljii Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema kalahariense Jeff.R.Stone & Kociolek
- Species Gomphonema kallarense Pardhi et al., 2020
- Species Gomphonema kamtschaticum Grunow, 1878 accepted as Pseudogomphonema kamtschaticum (Grunow) L.K.Medlin, 1986
- Species Gomphonema kanitzii J.Schaarschmidt
- Species Gomphonema kasnakowi
- Species Gomphonema kaweckana D.Metzeltin, A.Witkowski & Lange-Bertalot
- Species Gomphonema kaznakowi K.S.Mereschkowsky
- Species Gomphonema kerguelenensis E.E.Manguin, 1954
- Species Gomphonema kezlyae Pardhi et al., 2020
- Species Gomphonema khentiiense Metzeltin, lange-bertalot & Nergui, 2009
- Species Gomphonema kilhamii Kociolek & Stoermer, 1991
- Species Gomphonema kinkerii Pantocsek, 1892
- Species Gomphonema kobayashiae D.Metzeltin & Lange-Bertalot, 1998
- Species Gomphonema kobayasii Kociolek & J.C.Kingston, 1999
- Species Gomphonema kociolekii R.Jahn & N.Abarca
- Species Gomphonema kociolekii R.Jahn & N.Abarca in Abarca et al., 2020
- Species Gomphonema kolbei Skvortzow, 1969
- Species Gomphonema koreana Skvortzow, 1971
- Species Gomphonema kozufense Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema krammeri Reichardt
- Species Gomphonema krasskei Meister, 1934 (1935)
- Species Gomphonema lacifrigidum M.Kulikovskiy, J.P.Kociolek & Solak in Kociolek & Guiry, 2018
- Species Gomphonema lacunicola Patrick & Freese, 1961
- Species Gomphonema lacus-baikali Skvortzov, 2012
- Species Gomphonema lacusrankala Gandhi, 1958
- Species Gomphonema lacusrankaloides B.Karthick & J.P.Kociolek, 2012
- Species Gomphonema lacustre
- Species Gomphonema lacus-victoriense E.Reichardt, 2007
- Species Gomphonema lacus-victoriensis E. Reichardt, 2007
- Species Gomphonema lacus-vulcani Reichardt & Lange-Bertalot in Reichardt, 1997
- Species Gomphonema lagenula Kützing, 1844 accepted as Gomphonema parvulum (Kützing) Kützing, 1849
- Species Gomphonema lagenula sensu Schumann, 1869
- Species Gomphonema lagerheimei A.Cleve, 1895
- Species Gomphonema lagerheimii A.Cleve, 1895
- Species Gomphonema lanceolatum C.Agardh, 1831
- Species Gomphonema lanceolatum Ehrenberg, 1843
- Species Gomphonema lanceolatum Kützing, 1844
- Species Gomphonema lange-bertalotii Reichardt, 1997
- Species Gomphonema lapponicum (A.Cleve) Cleve-Euler
- Species Gomphonema latelanceolatum Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema lateripunctatum Reichardt & Lange-Bertalot, 1991
- Species Gomphonema latestriata Héribaud, 1903
- Species Gomphonema laticeps Ehrenberg, 1843
- Species Gomphonema laticollum E.Reichardt, 2001
- Species Gomphonema latipes E. Reichardt, 2001
- Species Gomphonema latistigmata Kociolek, Passy & Lowe in Passy, Kociolek & Lowe, 1997
- Species Gomphonema latius (F. Rich) E. Reichardt, 1999
- Species Gomphonema latum Skabichevskii, 1987
- Species Gomphonema leemanniae Cholnoky, 1954
- Species Gomphonema leibleini Agardh, 1831
- Species Gomphonema leifum Smedman, 1969
- Species Gomphonema lenormandi (Kützing) Chauvin in Kützing, 1849 accepted as Sphenella lenormandi Kützing, 1844
- Species Gomphonema lepidum Fricke in Schmidt et al., 1904
- Species Gomphonema leptocampum Kociolek & Stoermer, 1991
- Species Gomphonema leptoproductum H. Lange-Bertalot & S.I. Genkal in H. Lange-Bertalot (ed.), 1999
- Species Gomphonema licenti
- Species Gomphonema licmophoraoides Héribaud, 1903
- Species Gomphonema liebscheri E.Reichardt, 2012
- Species Gomphonema lindsayi Kociolek, Spaulding, Sabbe & Vyverman, 2004
- Species Gomphonema linea Ehrenberg, 1856
- Species Gomphonema lineare Gregory, 1857
- Species Gomphonema linearoides Z.Levkov, 2011
- Species Gomphonema lingratum Hustedt in Murobuse, 1941
- Species Gomphonema lingulatiforme Lange-Bertalot & Reichardt, 1991
- Species Gomphonema lingulatum Hustedt, 1927 accepted as Gomphonema grovei var. lingulatum (Hustedt) Lange-Bertalot, 1985
- Species Gomphonema lippertii E. Reichardt & H. Lange-Bertalot apud E. Reichardt, 1999
- Species Gomphonema littorale Hendey, 1977
- Species Gomphonema liyanlingae Metzeltin & Lange-Bertalot, 2009
- Species Gomphonema longiceps Ehrenberg, 1854
- Species Gomphonema longiceps Schumann
- Species Gomphonema longicolle Ehrenberg, 1846
- Species Gomphonema longilineare E. Reichardt, 1999
- Species Gomphonema longissimum Hustedt, 1942
- Species Gomphonema louisiananum Kalinsky, 1984
- Species Gomphonema lowei Kociolek, Spaulding, Sabbe & Vyverman, 2004
- Species Gomphonema lujanense E. Reichardt & N. Maidana in Reichardt, 2008
- Species Gomphonema lujanensis E.Reichardt & N.Maidana, 2008
- Species Gomphonema lychnidum Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema macedonicum Hustedt, 1945
- Species Gomphonema maclaughlinii E. Reichardt, 1999
- Species Gomphonema macrocostatum Hajós, 1973
- Species Gomphonema macropunctatum Krishnamurthy, 1954
- Species Gomphonema madagascarensis Spaulding & Kociolek, 1998
- Species Gomphonema maejoensis Foged, 1972
- Species Gomphonema magniaqua M.Kulikovskiy, J.P.Kociolek & Solak in Kociolek & Guiry, 2018
- Species Gomphonema magnifica H.P.Gandhi
- Species Gomphonema major Edwards ex Chase in Habirshaw et al., 1877-1894
- Species Gomphonema majusculum Harvey, 1841
- Species Gomphonema makaluense Reichardt, Jüttner & E.J.Cox
- Species Gomphonema makarovae Lange-Bertalot, 1999
- Species Gomphonema malayense Hustedt, 1942
- Species Gomphonema malista Hohn & Hellerman, 1963
- Species Gomphonema mammilla Ehrenberg, 1854
- Species Gomphonema manguinii Maillard validated by Moser, Steindorf & Lange-Bertalot, 1995
- Species Gomphonema manguinii D. Metzeltin & H. Lange-Bertalot, 2002
- Species Gomphonema manifestum Kociolek, Spaulding, Sabbe & Vyverman, 2004
- Species Gomphonema manubrium Fricke, 1904
- Species Gomphonema margaritaceum Ehrenberg, 1854
- Species Gomphonema margaritae J.Frenguelli & H.A.Orlando, 1958
- Species Gomphonema marginatum Héribaud, 1908
- Species Gomphonema marinum (Kützing) W.Smith, 1853 accepted as Gomphonema curvatum var. marinum Kützing, 1844
- Species Gomphonema marionense Van de Vijver & Gremmen, 2006
- Species Gomphonema mariovense Levkov & Tofilovska in Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema martini F.Fricke
- Species Gomphonema marvanii E.Reichardt, 2009
- Species Gomphonema matanensis D. Kapustin, Kociolek & Kulikovskiy in Kociolek et al., 2018
- Species Gomphonema maximum Grunow, 1880
- Species Gomphonema mayamae S.K.Das, C.Radhakrishnan, Kociolek & B.Karthick, 2018
- Species Gomphonema medioasiae D. Metzeltin, H. Lange-Bertalot & S. Nergui, 2009
- Species Gomphonema medioconstrictum Østrup, 1918 (1920)
- Species Gomphonema mediocris Skvortzov, 2012
- Species Gomphonema medio-inflatum Kociolek & Stoermer, 1990
- Species Gomphonema megalobrebissonii D.A.Chudaev, J.P.Kociolek & M.A.Golobova, 2014
- Species Gomphonema mehleri Camburn, 1978
- Species Gomphonema mereschkowskyii Skvortzov, 2012
- Species Gomphonema meridionale J.P.Kociolek & E.W.Thomas, 2009
- Species Gomphonema meridionalum J.P. Kociolek & E.W. Thomas in Thomas et al.
- Species Gomphonema mesta (S.I.Passy-Tolar & R.L.Lowe) E.Reichardt, 2007 accepted as Gomphoneis mesta S.I.Passy-Tolar & R.L.Lowe, 1994
- Species Gomphonema metzeltinii Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema metzeltinii You & Kociolek, 2015
- Species Gomphonema mexicanum Grunow, 1880
- Species Gomphonema microcapitatum Kulikovskiy, Kociolek & Solak, 2018
- Species Gomphonema microlanceolatum You & Kociolek, 2015
- Species Gomphonema microlaticollum Kulikovskiy, Kociolek & Solak, 2018
- Species Gomphonema micropumilum Reichardt, 1997
- Species Gomphonema micropus Kützing, 1844
- Species Gomphonema micropus Fricke in Schmidt et al., 1902
- Species Gomphonema migmatitum N.Woodhead & R.D.Tweed, 1958
- Species Gomphonema mihoi Z.Levkov, 2011
- Species Gomphonema minuscula Krasske, 1932
- Species Gomphonema minusculum Krasske
- Species Gomphonema minusculum Cleve-Euler, 1949
- Species Gomphonema minusculum A. Cleve-Euler, 1949
- Species Gomphonema minustissimum Greville, 1827
- Species Gomphonema minutiforme H. Lange-Bertalot & E. Reichardt in Krammer & Lange-Bertalot, 1991
- Species Gomphonema minutissimum Greville, 1827 accepted as Exilaria minutissima (Greville) Berkeley, 1832
- Species Gomphonema minutissimum Brébisson
- Species Gomphonema minutissimum auct. non Greville
- Species Gomphonema minutissimum Kützing, 1833 (1834)
- Species Gomphonema minutum (C.Agardh) C.Agardh, 1831
- Species Gomphonema minutum Fusey, 1953
- Species Gomphonema miocenica Moiseeva, 1959
- Species Gomphonema modicum Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema molaris Cleve
- Species Gomphonema mongoliosinica Lange-bertalot, Reichardt & Metzeltin, 2009
- Species Gomphonema moniliforme Gandhi, 1960
- Species Gomphonema montanum (J.Schumann) Grunow, 1878 accepted as Gomphonema acuminatum var. montanum J.Schumann, 1867
- Species Gomphonema montezumense Czarnecki & Blinn, 1979
- Species Gomphonema moresbyanum E.Reichardt, 2005
- Species Gomphonema morii Skvortzow, 1929
- Species Gomphonema mossambicense Ehrenberg, 1854
- Species Gomphonema mucronatum Ehrenberg, 1854
- Species Gomphonema muelleri E.Reichardt, 2007
- Species Gomphonema multiforme Kociolek, Spaulding, Sabbe & Vyverman, 2004
- Species Gomphonema mustela Ehrenberg, 1854 accepted as Gomphonema longiceps Ehrenberg, 1854
- Species Gomphonema mutunensis Ruwer, Ludwig & Rodrigues, 2019
- Species Gomphonema nagpurense Sarode & Kamat, 1984
- Species Gomphonema nasuta Ehrenberg
- Species Gomphonema nasutum Ehrenberg, 1843
- Species Gomphonema nathorstii Foged, 1964
- Species Gomphonema navicella Otto Müller, 1905
- Species Gomphonema navicelloides Frenguelli, 1942
- Species Gomphonema naviculaceum Pantocsek, 1902
- Species Gomphonema naviculoides W. Smith, 1856
- Species Gomphonema naviculoides Skabichevskii, 1987
- Species Gomphonema nediense Reichardt, Jüttner & E.J.Cox
- Species Gomphonema neoapiculatum Lange-Bertalot, Reichardt & Metzeltin in Metzeltin & Lange-Bertalot, 1998
- Species Gomphonema neobourrellyi Moser & Lange-Bertalot in Moser, Steindorf & Lange-Bertalot, 1995
- Species Gomphonema neocaledonica E.Manguin ex Kociolek & Reviers, 1996
- Species Gomphonema neonasutum H. Lange-Bertalot & E. Reichardt apud D. Metzeltin & H. Lange-Bertalot, 1998
- Species Gomphonema neosimplex VanLandingham, 1971
- Species Gomphonema neotropicum N.Abarca & D.Mora
- Species Gomphonema neotropicum N.Abarca & D.Mora in Abarca et al., 2020
- Species Gomphonema nepalense Reichardt, Jüttner & E.J.Cox
- Species Gomphonema nesophilum Kociolek, J. P. & Woodward, J.
- Species Gomphonema netriviale Gerd Moser
- Species Gomphonema nipponica Skvortzow, 1936
- Species Gomphonema nobilis Edsbagge, 1968
- Species Gomphonema novacula M.H.Hohn & J.Hellerman, 1963
- Species Gomphonema novae-zealandiae Skvortzov, 2012
- Species Gomphonema novo-zelandicum Booth, 1984
- Species Gomphonema obesoccultum Reichardt
- Species Gomphonema obscurum Krasske, 1939 accepted as Gomphonemopsis obscura (Krasske) Lange-Bertalot, 1996
- Species Gomphonema obstipum Potapova, Ponader & Desianti, 2017
- Species Gomphonema obtusatum (Kützing) Grunow, 1880 accepted as Sphenella obtusata Kützing, 1844
- Species Gomphonema obtusum Ehrenberg, 1854
- Species Gomphonema occidentale
- Species Gomphonema occultum Reichardt & Lange-Bertalot, 1991
- Species Gomphonema oceanicum Cholnoky, 1968
- Species Gomphonema oculatum Kützing, 1833 (1834)
- Species Gomphonema oestrupii Pantocsek, 1908
- Species Gomphonema okamurae Skvortzow, 1929
- Species Gomphonema okavangoanum Lange-Bertalot & Reichardt in Lange-Bertalot, 1993
- Species Gomphonema olivaceoides Hustedt, 1950 accepted as Gomphonema olivaceum var. olivaceoides (Hustedt) Lange-Bertalot, 1989
- Species Gomphonema olivaceolacuum (Lange-Bertalot & Reichardt) Lange-Bertalot & Reichardt, 2004 accepted as Gomphonema olivaceum var. olivaceolacuum Lange-Bertalot & Reichardt, 1993
- Species Gomphonema olivaceum (Hornemann) Brébisson, 1838
- Species Gomphonema olivaceum (Lyngbye) Desmazières, 1825
- Species Gomphonema olivaceum (Hornemann) Kützing, 1844
- Species Gomphonema olivaceum (Hornemann) Ehrenberg, 1838
- Species Gomphonema olivaeformis Manguin, 1964
- Species Gomphonema olor Ehrenberg, 1849
- Species Gomphonema opimum Kociolek & Reviers, 1996
- Species Gomphonema oregonicum Ehrenberg
- Species Gomphonema ovatum H.L. Smith, 1860
- Species Gomphonema ovatum Østrup, 1913
- Species Gomphonema ovulum Pantocsek, 1902
- Species Gomphonema oxycephalum Cleve
- Species Gomphonema pachycladum Brébisson, 1838
- Species Gomphonema paddockii Kociolek & Stoermer, 1991
- Species Gomphonema pala E.Reichardt, 2001
- Species Gomphonema palea Ehrenberg, 1842
- Species Gomphonema paludosum E. Reichardt, 1999
- Species Gomphonema palustris Fusey, 1848
- Species Gomphonema paracapitatum Kulikovskiy, Kociolek & Solak, 2018
- Species Gomphonema paradaphnoides Cejudo-Figueiras, S.Blanco & Ãlvarez-Blanco, 2012
- Species Gomphonema paradoxum Agardh, 1824
- Species Gomphonema paradoxum Ehrenberg, 1832
- Species Gomphonema paradoxum Smith, 1860
- Species Gomphonema paraexilissimum Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema parallelistriatum H. Lange-Bertalot & Reichardt in Krammer & Lange-Bertalot, 1991
- Species Gomphonema parapygmaeum Jüttner & Kociolek in Jüttner et al., 2018
- Species Gomphonema pararhombicum Reichardt, Jüttner & E.J.Cox
- Species Gomphonema parasundaense Jüttner in Jüttner et al., 2018
- Species Gomphonema paratergestinum Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema parva
- Species Gomphonema parvicapitatum Kociolek in Kociolek et al., 2014
- Species Gomphonema parvula Rabenhorst, 1853
- Species Gomphonema parvuliforme Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema parvulissima Carter, 1970
- Species Gomphonema parvulius (Lange-Bertalot & E.Reichardt) Lange-Bertalot & E.Reichardt, 1996 accepted as Gomphonema parvulum var. parvulius Lange-Bertalot & Reichardt, 1993
- Species Gomphonema parvuloides Cholnoky, 1966
- Species Gomphonema parvulum (Kützing) Kützing, 1849
- Species Gomphonema parvum Héribaud, 1903
- Species Gomphonema patagonicum Krasske, 1939
- Species Gomphonema patricki Kociolek & Stoermer in Kociolek, Stoermer & Edlund, 1995
- Species Gomphonema pediculus
- Species Gomphonema pedrerense D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Gomphonema peisonis Pantocsek, 1912
- Species Gomphonema pelisteriense Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema peracutum Spaulding & Kociolek, 1998
- Species Gomphonema peragalli Cleve-Euler, 1955
- Species Gomphonema peragalloi Lauby, 1910
- Species Gomphonema perapicatum D. Metzeltin & H. Lange-Bertalot, 2007
- Species Gomphonema perdurans Kociolek, Spaulding, Sabbe & Vyverman, 2004
- Species Gomphonema perfidum Héribaud, 1908
- Species Gomphonema periintricatum Kociolek, Spaulding, Sabbe & Vyverman, 2004
- Species Gomphonema perinsignis Spaulding & Kociolek, 1998
- Species Gomphonema perminuta Cholnoky, 1957
- Species Gomphonema perolivaceoides Levkov, 2007
- Species Gomphonema perolivaceolacuum Z.Levkov, 2011
- Species Gomphonema perpusillum Zeller
- Species Gomphonema persicum Rabenhorst, 1853
- Species Gomphonema pertusum Kociolek, Spaulding, Sabbe & Vyverman, 2004
- Species Gomphonema peruanum Grunow in Van Heurck, 1880
- Species Gomphonema peruvianum Grunow in Cleve, 1894
- Species Gomphonema pfannkucheae Cholnoky, 1966
- Species Gomphonema pierrebourrellyi Fourtanier & Kociolek, 1998
- Species Gomphonema pinnatum Pantocsek, 1913
- Species Gomphonema pinnularoides Mayer, 1917
- Species Gomphonema pisciculus Héribaud, 1908
- Species Gomphonema platypus Østrup, 1910
- Species Gomphonema pohliaeformis Kützing, 1833 (1834)
- Species Gomphonema popovae Lavadnaja, 1973
- Species Gomphonema possessionense B. Van de Vijver & L. Beyens in Van de Vijver, Frenot & Beyens, 2002
- Species Gomphonema potaroense Metzeltin & Lange-Bertalot, 1998
- Species Gomphonema praelanceolatum Tscheremissinova, 1971
- Species Gomphonema pratense H. Lange-Bertalot & E. Reichardt apud E. Reichardt, 1999
- Species Gomphonema preliciae Levkov, Mitic-Kopanja & E. Reichardt, 2016
- Species Gomphonema prespanense Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema procerum Reichardt & Lange-Bertalot, 1991
- Species Gomphonema productum (Grunow) Lange-Bertalot & Reichardt, 1993
- Species Gomphonema protractum Kociolek & Stoermer, 1990
- Species Gomphonema prowsei Glushchenko, Kulikovskiy & Kociolek, 2017
- Species Gomphonema pseudacuminatum Kulikovskiy, Kociolek & Solak, 2015
- Species Gomphonema pseudaffine Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema pseudexiguum R.Simonsen accepted as Gomphonemopsis pseudexigua (Simonsen) Medlin in Medlin & Round, 1986
- Species Gomphonema pseudoaugur Lange-Bertalot, 1979
- Species Gomphonema pseudobohemicum Lange-Bertalot & Reichardt in Lange-Bertalot & Metzeltin, 1996
- Species Gomphonema pseudoclavatum Lange-Bertalot & Reichardt in Lange-Bertalot, Kulbs, Lauser, Norpel-Schempp & Willmann, 1996
- Species Gomphonema pseudoexiguum Simonsen, 1959
- Species Gomphonema pseudointermedium E.Reichardt, 2008
- Species Gomphonema pseudoparvulum Kociolek, J. P. & Woodward, J.
- Species Gomphonema pseudopusillum E. Reichardt, 1999
- Species Gomphonema pseudoseptatum Giffen, 1970
- Species Gomphonema pseudosphaerophorum H.Kobayasi, 1988
- Species Gomphonema pseudotenellum Lange-Bertalot, 1985
- Species Gomphonema puiggarianum
- Species Gomphonema pulvillum Spaulding & Kociolek, 1998
- Species Gomphonema pulvinatum Braun ex Rabenhorst, 1853
- Species Gomphonema pumiloides Cholnoky, 1963
- Species Gomphonema pumilum (Grunow) E.Reichardt & Lange-Bertalot, 1991 accepted as Gomphonema intricatum var. pumila Cleve-Euler, 1932
- Species Gomphonema punae H. Lange-Bertalot & Rumrich in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
- Species Gomphonema punctatum Hustedt, 1938
- Species Gomphonema pupula Ehrenberg, 1843
- Species Gomphonema pusillum (Grunow, 1880) Kulikovskiy & Kociolek, 2018
- Species Gomphonema pygmaeoides You & Kociolek, 2015
- Species Gomphonema pygmaeum Kociolek & Stoermer, 1991
- Species Gomphonema pyrarium (O.F.Müller) Ehrenberg
- Species Gomphonema pyrenaicum E.Reichardt, 2005
- Species Gomphonema pyriferum Suhr.
- Species Gomphonema qingyiensis L-X. Zhang, P. Yu & Q-M. You in Zhang et al., 2020
- Species Gomphonema quadratarea Spaulding & Kociolek, 1998
- Species Gomphonema quadratum K.E. Lohman, 1957
- Species Gomphonema quadripunctatum (Østrup) Wislouch, 1924 accepted as Gomphoneis quadripunctatum (Østrup) P.Dawson ex R.Ross & P.A.Sims, 1978
- Species Gomphonema quadripunctatum Skabichevskii, 1985
- Species Gomphonema quadripunctatum Skabichevskii, 1985
- Species Gomphonema quasicrocodilei S.I.Passy, J.P.Kociolek & R.L.Lowe, 1997
- Species Gomphonema radicula Suhr.
- Species Gomphonema ramosissimum Naegeli in Kutzing, 1849
- Species Gomphonema ramosum (Agardh) Kützing, 1833 (1834) accepted as Diatoma ramosum Agardh, 1832
- Species Gomphonema raraense Jüttner & S.Gurung in Jüttner et al., 2018
- Species Gomphonema rautenbachiae Cholnoky, 1959
- Species Gomphonema ravidum Kociolek, Spaulding, Sabbe & Vyverman, 2004
- Species Gomphonema reediae Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema reichardtii Lange-Bertalot in Lange-Bertalot & Metzeltin, 1996
- Species Gomphonema reichelti M. Schmidt in Schmidt et al., 1899
- Species Gomphonema reimeri J.P.Kociolek & J.C.Kingston, 1999
- Species Gomphonema resendei A.R.Moura
- Species Gomphonema resendi Moura, 1963
- Species Gomphonema respectabile D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Gomphonema rexlowei Liu & Kociolek, 2013
- Species Gomphonema rhombeum Ehrenberg, 1854
- Species Gomphonema rhombiciforme Metzeltin & Lange-Bertalot, 1998
- Species Gomphonema rhombicum Fricke, 1904
- Species Gomphonema ricardii Maillard validated by Moser, Steindorf & Lange-Bertalot, 1995
- Species Gomphonema rigidum Héribaud, 1903
- Species Gomphonema rimetiana Kulikovskiy, Kociolek & Solak in Kociolek et al., 2018
- Species Gomphonema riotecense Lange-Bertalot, Reichardt & Metzeltin in Metzeltin & Lange-Bertalot, 1998
- Species Gomphonema ristovskae Levkov & Tofilovska in Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema robustum Grunow, 1877
- Species Gomphonema rochense D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Gomphonema roehringeri E. Reichardt, 1999
- Species Gomphonema rosenstockianum H. Lange-Bertalot & Reichardt, 1993
- Species Gomphonema rostellatum (Kützing) G.L.Rabenhorst
- Species Gomphonema rostratum L.A.Brébisson & Godey
- Species Gomphonema rostratum W. Smith, 1856
- Species Gomphonema rotundatum Ehrenberg, 1830
- Species Gomphonema rupestre
- Species Gomphonema russicum Kulikovskiy, Kociolek & Solak in Kociolek et al., 2018
- Species Gomphonema ruttneri (Hustedt) F.W.Mills, 1934 † accepted as Gomphocymbella ruttneri Hustedt, 1913 †
- Species Gomphonema saccatum Reichardt, Jüttner & E.J.Cox
- Species Gomphonema sagitta Schumann, 1863
- Species Gomphonema salae Lange-Bertalot & Reichardt in Metzeltin & Lange-Bertalot, 1998
- Species Gomphonema salinarum (Pantosek) Cleve, 1894
- Species Gomphonema salsa Pantocsek, 1889
- Species Gomphonema sancte floretense Østrup in Heribaud et al., 1920
- Species Gomphonema sanctenectairense Rochoux d'Aubert in Héribaud et al., 1920
- Species Gomphonema sancti-naumii D.Metzeltin & Z.Levkov, 2007
- Species Gomphonema saparense S.K.Das, C.Radhakrishnan, Kociolek & B.Karthick, 2018
- Species Gomphonema saravathense Gandhi, 1970
- Species Gomphonema sarcophagus Gregory, 1856 accepted as Gomphonema angustatum var. sarcophagus (Gregory) Grunow, 1880
- Species Gomphonema savannae Ehrenberg, 1854
- Species Gomphonema saxonicum Rabenhorst, 1848-1860
- Species Gomphonema scapha M. Schmidt in Schmidt et al., 1899
- Species Gomphonema scardicum D.Mitic-Kopanja, C.E.Wetzel, L.Ector & Z.Levkov, 2014
- Species Gomphonema sceptrum Rabenhorst, 1853
- Species Gomphonema schantungensis (Skvortzow) Skvortzow, 1971 accepted as Gomphonema tergestinum var. shantungensis Skvortzow, 1937
- Species Gomphonema scharfii H. Lange-Bertalot & Rumrich in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
- Species Gomphonema schweicherdtii Cholnoky, 1953
- Species Gomphonema scoticollegarum H. Lange-Bertalot apud E. Reichardt, 1999
- Species Gomphonema selengensis Skvortzow, 1971
- Species Gomphonema semiapertoides Kociolek & Stoermer, 1990
- Species Gomphonema semiapertum Grunow, 1880
- Species Gomphonema semicruciatum Woodhead & Tweed, 1960
- Species Gomphonema semiellipticum Agardh, 1831
- Species Gomphonema separatipunctatum Kobayashi, 1964
- Species Gomphonema septatum Agardh, 1831
- Species Gomphonema septentrionale Østrup, 1895 accepted as Pseudogomphonema septentrionale (Østrup) L.K.Medlin, 1986
- Species Gomphonema septum F.Moghadam, 1969
- Species Gomphonema sessile Brébisson
- Species Gomphonema setianum Zanon, 1928
- Species Gomphonema shanghaiensis Zhang & Kociolek, 2016
- Species Gomphonema shangtungensis (Skvortzov, 2012)
- Species Gomphonema shengxianensis Huang in Huang & Cai, 1984
- Species Gomphonema shiwania Y.Liu, Kulikovskiy & Kociolek in Zhang et al., 2020
- Species Gomphonema siamense E.Reichardt, 2005
- Species Gomphonema siberica (Grunow) M. Schmidt in Schmidt et al., 1899 accepted as Gomphonema geminatum var. sibericum Grunow, 1878
- Species Gomphonema sibericum Kulikovskiy, Kociolek & Solak in Kociolek et al., 2018 accepted as Gomphonema lacifrigidum M.Kulikovskiy, J.P.Kociolek & Solak in Kociolek & Guiry, 2018
- Species Gomphonema sibirica Skvortzow & Meyer, 1928
- Species Gomphonema sichuanenesis Y.Li & J.P.Kociolek, 2010
- Species Gomphonema sichuanensis Li & Kociolek in Li et al., 2010
- Species Gomphonema sierrianum Stancheva & Kociolek, 2016
- Species Gomphonema sigma Ehrenberg, 1854
- Species Gomphonema signyensis Kociolek & Jones, 1995
- Species Gomphonema silicula Ehrenberg, 1854
- Species Gomphonema simplex Kützing, 1833 (1834)
- Species Gomphonema simplex Manguin, 1962
- Species Gomphonema simus M.H.Hohn & J.Hellerman, 1963
- Species Gomphonema sinestigma Reichardt, Jüttner & E.J.Cox
- Species Gomphonema sinica Skvortzow, 1929
- Species Gomphonema sipanguelensis Li, 1983
- Species Gomphonema skvortzowii Nikolaev, 1970
- Species Gomphonema sonfonense N.Woodhead & R.D.Tweed, 1958
- Species Gomphonema sosenstockianum Lange-Bertalot & Reichardt in Lange-Bertalot, 1993
- Species Gomphonema sparsistriatum O.Müller, 1905
- Species Gomphonema spatiosum E.W.Thomas & J.P.Kociolek, 2009
- Species Gomphonema spatulum Carter, 1966
- Species Gomphonema spauldingae D. Metzeltin & H. Lange-Bertalot, 2002
- Species Gomphonema spectabilissimum Metzeltin & Lange-Bertalot, 1998
- Species Gomphonema sphaerophoroides Hustedt, 1965
- Species Gomphonema sphaerophorum Ehrenberg, 1845
- Species Gomphonema sphenelloides Rabenhorst, 1853
- Species Gomphonema sphenovertex Lange-Bertalot & Reichardt in Lange-Bertalot & Metzeltin, 1996
- Species Gomphonema spicula Gandhi, 1958
- Species Gomphonema spicula Manguin in Bourrelly & Manguin, 1952
- Species Gomphonema spiculoides H.P.Gandhi
- Species Gomphonema spirkovskae Levkov & Mitic-Kopanja in Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema splendidum (Greville) Brébisson, 1838
- Species Gomphonema stauroneiforme Grunow
- Species Gomphonema staurophorum (Pantocsek) Cleve-Euler, 1955
- Species Gomphonema stigmatellum Spaulding & Kociolek, 1998
- Species Gomphonema stiria Hohn & Hellerman, 1963
- Species Gomphonema stoermeri J.P.Kociolek & J.C.Kingston, 1999
- Species Gomphonema stonei E. Reichardt, 1999
- Species Gomphonema strictum (Maillard) Lange-Bertalot & Moser in Moser, Steindorf & Lange-Bertalot, 1995 accepted as Gomphonema bourrellyi var. stricta Maillard, 1978
- Species Gomphonema subacaule Kützing, 1836
- Species Gomphonema subaequale Z.Levkov, 2011
- Species Gomphonema subaequatoriale Aleem, 1958
- Species Gomphonema subaerophilum H. Lange-Bertalot in Werum & Lange-Bertalot, 2004
- Species Gomphonema subangustatum H.Lange-Bertalot, P.Cavacini, N.Tagliaventi & S.Alfinito, 2003
- Species Gomphonema subantarcticum B. Van de Vijver & L. Beyens in Van de Vijver, Frenot & Beyens, 2002
- Species Gomphonema subapicatum F.E.Fritsch & M.F.Rich
- Species Gomphonema subarcticum H. Lange-Bertalot & E. Reichardt apud H. Lange-Bertalot & S.I. Genkal, 1999
- Species Gomphonema subbulbosum E.Reichardt, 2008
- Species Gomphonema subclavatum Grunow in Van Heurck, 1880
- Species Gomphonema subcymbellum Messikommer, 1927
- Species Gomphonema subinsigniforme L.Ge, Y.Liu & J.P.Kociolek, 2014
- Species Gomphonema sublaticollum Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema sublitorale Skabichevskii, 1976
- Species Gomphonema submalayense Gandhi, 1970
- Species Gomphonema submehleri Kociolek & Stoermer, 1991
- Species Gomphonema subnaviculoides Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema subodhii Jüttner & S.Gurung in Jüttner et al., 2018
- Species Gomphonema subolivaceum Levkov & Nakov, 2007
- Species Gomphonema subparvulum Ermolajeva, 1956
- Species Gomphonema subramosum C.A.Agardh
- Species Gomphonema subsalinum Wislouch & Poretzky, 1924
- Species Gomphonema subtile Ehrenberg, 1843
- Species Gomphonema subtile sensu Brun, 1880
- Species Gomphonema subtiliforme Hustedt, 1942
- Species Gomphonema subula Carter & Denny, 1982
- Species Gomphonema subulatum Cleve-Euler, 1932
- Species Gomphonema subventricosum Hustedt, 1938
- Species Gomphonema suhmii Foged, 1966
- Species Gomphonema sumatrense Fricke in Schmidt et al., 1904
- Species Gomphonema sundaense E.Reichardt, 2005
- Species Gomphonema superiorensis Kociolek & Stoermer, 1991
- Species Gomphonema supersedens E. Reichardt, 1999
- Species Gomphonema supertergestinum E.Reichardt, 2009
- Species Gomphonema suspectum Meister, 1932
- Species Gomphonema svalbardense E.Pinseel, K.Kopalová & Van der Vijver, 2014
- Species Gomphonema swatmani Reinhold, 1937
- Species Gomphonema szaboi Pantocsek, 1892
- Species Gomphonema tackei Hustedt, 1942
- Species Gomphonema taiaensis Carter & Denny, 1982
- Species Gomphonema tamilense B.Karthick & J.P.Kociolek, 2012
- Species Gomphonema tarraleahae K.J.Perkins & G.M.Hallegraeff, 2009
- Species Gomphonema telographicum Kützing, 1844
- Species Gomphonema tenellum Kützing, 1844 accepted as Gomphonema pseudotenellum Lange-Bertalot, 1985
- Species Gomphonema tenellum sensu W. Smith, 1853
- Species Gomphonema tenellum sensu Grunow in Van Heurck, 1880
- Species Gomphonema tenerrimum Hustedt, 1938
- Species Gomphonema tenoccultum Reichardt
- Species Gomphonema tenue Fricke, 1902
- Species Gomphonema tenuicolle Ehrenberg, 1854
- Species Gomphonema tenuis Gandhi, 1960
- Species Gomphonema tenuissimum Fricke in Schmidt et al., 1904
- Species Gomphonema teodorescui Tarnavschi & Oltean, 1961
- Species Gomphonema tergestinum (Grunow in Van Heurck) Fricke, 1902
- Species Gomphonema tertiarium Kociolek & Stoermer, 1990
- Species Gomphonema tetrasigmata Horikawa & Okuno in Okuno
- Species Gomphonema tetrastigmatum Horikawa & Okuno, 1944 †
- Species Gomphonema tholus Carter & Denny, 1992
- Species Gomphonema thumii (Fricke) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Gomphonema tinctum C.Agardh, 1831
- Species Gomphonema towutense Hustedt, 1942
- Species Gomphonema transylvanicum Pantocsek, 1892
- Species Gomphonema triangulare Playfair, 1914
- Species Gomphonema tridens Ehrenberg, 1855
- Species Gomphonema tridentulum Rabenhorst, 1856
- Species Gomphonema trigonocephalum Ehrenberg, 1854
- Species Gomphonema tristigmatum D. Metzeltin & H. Lange-Bertalot, 1998
- Species Gomphonema tropicale Brun ex M. Schmidt et al., 1899
- Species Gomphonema trulliforme Kociolek, Spaulding, Sabbe & Vyverman, 2004
- Species Gomphonema truncatum Ehrenberg, 1832
- Species Gomphonema tumens Kociolek & Stoermer, 1991
- Species Gomphonema tumidum (Skvortzow & Meyer) Lange-Bertalot & Reichardt in K. Krammer & Lange-Bertalot, 1991
- Species Gomphonema turgidum Ehrenberg, 1854
- Species Gomphonema turris Ehrenberg, 1843 accepted as Gomphonema augur var. turris (Ehrenberg) Lange-Bertalot, 1985
- Species Gomphonema turris auct. non Ehrenberg
- Species Gomphonema turritum Ehrenberg, 1854
- Species Gomphonema undulans I.Ãlvarez-Blanco, C.Cejudo-Figueiras & S.Blanco, 2013
- Species Gomphonema undulatum Hustedt, 1935
- Species Gomphonema undulatum Ehrenberg
- Species Gomphonema uniserhombicum E.Reichardt, 2005
- Species Gomphonema uruguayense D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Gomphonema utae Lange-Bertalot & E.Reichardt, 1999
- Species Gomphonema vaipohense Ricard, 1975
- Species Gomphonema valentinica Nikolaev, 1970
- Species Gomphonema validum Cleve, 1894
- Species Gomphonema vamaensis Foged, 1959
- Species Gomphonema vanheurckii Pantocsek, 1902
- Species Gomphonema varanasis Singh, 1961
- Species Gomphonema vardarense Levkov, Mitic-Kopanja & E.Reichardt, 2016
- Species Gomphonema variabilis A.Jurilj, 1957
- Species Gomphonema varikuli Foged, 1972
- Species Gomphonema varioreduncum Jüttner, Ector, E. Reichardt, Van de Vijver & E.J.Cox, 2013
- Species Gomphonema variostigmatum E.Reichardt, 2007
- Species Gomphonema variostriatum K.E. Camburn & D.F. Charles, 2000
- Species Gomphonema variscohercynicum H. Lange-Bertalot & E. Reichardt apud E. Reichardt, 1999
- Species Gomphonema vastum F.Hustedt
- Species Gomphonema ventricosum Gregory, 1856
- Species Gomphonema ventricosum Skabichevskii, 1985
- Species Gomphonema venusta Passy, Kociolek & Lowe, 1997
- Species Gomphonema vetustum E.Reichardt, 2007 †
- Species Gomphonema vibrio Ehrenberg, 1843
- Species Gomphonema vibrioides Reichardt & Lange-Bertalot, 1991
- Species Gomphonema vidalii Beltrami & Ector, 2010
- Species Gomphonema vidarbhense Sarode & Kamat, 1984
- Species Gomphonema viride Unger, 1839
- Species Gomphonema vitreum Grunow, 1878
- Species Gomphonema vivrio
- Species Gomphonema vulgare (Kützing) G.L.Rabenhorst, 1864 accepted as Gomphocymbella vulgaris (Kützing) Otto Müller, 1905
- Species Gomphonema vulgare Brébisson, 1838
- Species Gomphonema wangii Skvortzov, 2012
- Species Gomphonema welwitschii Comber, 1901
- Species Gomphonema westii Spaulding & Kociolek, 1998
- Species Gomphonema williamsii Kociolek & Liu, 2013
- Species Gomphonema wiltschkorum H. Lange-Bertalot apud H. Lange-Bertalot & S.I. Genkal, 1999
- Species Gomphonema witkowskii Kociolek & Liu, 2013
- Species Gomphonema wolterecki Hustedt, 1942
- Species Gomphonema wulasiense Foged, 1966
- Species Gomphonema wuyiensis W.Zhang & Kociolek in Zhang et al., 2018
- Species Gomphonema xiantaoicum Z.X.Shi & N.Li in Z.X.Shi, 2014
- Species Gomphonema xinjiangianum You & Kociolek, 2015
- Species Gomphonema xiphoidea Skvortzov, 1976
- Species Gomphonema yangtzensis Li in Li, Gong, Xie & Shen, 2006
- Species Gomphonema yaominae Li, 2012
- Species Gomphonema yatukaensis Horikawa & H.Okuno, 1944 †
- Species Gomphonema yberiense Frenguelli, 1933
- Species Gomphonema yucatanense Metzeltin & Lange-Bertalot, 1998
- Species Gomphonema yunnaniana Y.Liu et Kociolek in Liu et al., 2020
- Species Gomphonema zairense Compère, 1995
- Species Gomphonema zambezicum Cholnoky, 1954
- Species Gomphonema zellense E. Reichardt, 1999
- Genus Gomphopleura H. Reichelt ex Tempère, 1894 †
- Genus Gomphosinica Kociolek, You, X.Wang & Q.Liu, 2015 (13)
- Genus Reimeria J.P. Kociolek & E.F. Stoermer, 1987 (6)
- Family Rhoicospheniaceae Chen & Zhu, 1983 (30)
- Order Dictyoneidales
- Order Lyrellales (15)
- Order Mastogloiales (88)
- Order Naviculales (2 077)
- Order Rhopalodiales (37)
- Order Surirellales (174)
- Order Thalassiophysales (105)
- Superorder Bacillariophycidae incertae sedis (32)
- Superorder Eunotiophycanae (293)
- Subclass Coscinodiscophycidae (877)
- Subclass Fragilariophycidae (483)
- Order Centrales
