Gomphonema abbreviatum (Agardh) Kützing, 1833 (uncertain > unassessed )
Gomphonema abbreviatum auct. non Agardh (uncertain > unassessed )
Gomphonema abbreviatum C.Agardh, 1831 accepted as Rhoicosphenia abbreviata (C.Agardh) Lange-Bertalot, 1980
Gomphonema abbreviatum f. abbreviatum Agardh, 1831 (uncertain > unassessed )
Gomphonema abbreviatum f. inflata Hustedt, 1953 (uncertain > unassessed )
Gomphonema abbreviatum f. minor Krishnamurthy, 1954 (uncertain > unassessed )
Gomphonema abbreviatum var. acuminata Héribaud-Joseph (uncertain > unassessed )
Gomphonema abbreviatum var. acuminatum Héribaud, 1903 (uncertain > unassessed )
Gomphonema abbreviatum var. brasiliense Grunow in Van Heurck, 1880 (uncertain > unassessed )
Gomphonema abbreviatum var. brevipes (Kützing) Kützing, 1844 accepted as Gomphonema brevipes Kützing, 1833 (1834)
Gomphonema abbreviatum var. demerarae Grunow ex Cleve & Moller, 1882 (uncertain > unassessed )
Gomphonema abbreviatum var. genuinum Cleve-Euler, 1955 (uncertain > unassessed )
Gomphonema abbreviatum var. japonicum Skvortzov & Noda, 1971 (uncertain > unassessed )
Gomphonema abbreviatum var. japonicum Skvortzov, 2012 (uncertain )
Gomphonema abbreviatum var. longipes Kützing, 1844 (uncertain > unassessed )
Gomphonema abbreviatum var. pulneyensis Krischnamurthy, 1954 (uncertain > unassessed )
Gomphonema abbreviatum var. sphenelloides (Rabenhorst) Rabenhorst, 1864 accepted as Gomphonema sphenelloides Rabenhorst, 1853
Gomphonema abbreviatum var. typicum Kirchner, 1878 (uncertain > unassessed )
Gomphonema abbreviatum var. ventrale M.B. Florin in Cleve-Euler, 1955 (uncertain > unassessed )
Gomphonema acceptatum Levkov, Mitic-Kopanja & E.Reichardt, 2016
Gomphonema accessum Héribaud, 1903 (uncertain > unassessed )
Gomphonema acidoclinatiforme D. Metzeltin & H. Lange-Bertalot, 2002 (uncertain > unassessed )
Gomphonema acidoclinatum Lange-Bertalot & Reichardt, 2004 (uncertain > unassessed )
Gomphonema aciforme Kociolek, Spaulding, Sabbe & Vyverman, 2004 (uncertain > unassessed )
Gomphonema aculeiferum Kociolek & Stoermer, 1990 (uncertain > unassessed )
Gomphonema acuminatum Ehrenberg, 1832
Gomphonema acuminatum sensu Grunow in Van Heurck, 1880 (uncertain > unassessed )
Gomphonema acuminatum f. acuminatoides Mayer, 1928 (uncertain > unassessed )
Gomphonema acuminatum f. acuminatum Ehrenberg, 1832 (uncertain > unassessed )
Gomphonema acuminatum f. brebissoniformis Mayer, 1928 (uncertain > unassessed )
Gomphonema acuminatum f. brebissonii (Kützing) Cleve, 1894 accepted as Gomphonema brebissonii Kützing, 1849
Gomphonema acuminatum f. brebissonii Heiden in Heiden & Kolbe, 1928 (uncertain > unassessed )
Gomphonema acuminatum f. coronata (Ehrenberg) Cleve, 1894 (uncertain > unassessed )
Gomphonema acuminatum f. coronatum (Ehrenberg; Kutzing) W. Smith, 1853 (uncertain > unassessed )
Gomphonema acuminatum f. curta Cleve-Euler, 1932 (uncertain > unassessed )
Gomphonema acuminatum f. curta F.W. Mills, 1934 (uncertain > unassessed )
Gomphonema acuminatum f. curta Mayer, 1916 (1917) (uncertain > unassessed )
Gomphonema acuminatum f. dippelii Woodhead & Tweed, 1960 (uncertain > unassessed )
Gomphonema acuminatum f. elongatum (W. Smith) Skvortzow, 1929 (uncertain > unassessed )
Gomphonema acuminatum f. elongatum (W. Smith; W. Smith) Rabenhorst, 1864 accepted as Gomphonema elongatum var. elongatum W. Smith, 1855
Gomphonema acuminatum f. hastata A. Cleve, 1895 (uncertain > unassessed )
Gomphonema acuminatum f. intermedia Dippel, 1905 (uncertain > unassessed )
Gomphonema acuminatum f. laticeps (Ehrenberg) L.Dippel, 1905 accepted as Gomphonema laticeps Ehrenberg, 1843
Gomphonema acuminatum f. malayensis Hustedt, 1942 (uncertain > unassessed )
Gomphonema acuminatum f. pantocsekii Cleve-Euler, 1932 (uncertain > unassessed )
Gomphonema acuminatum f. pusilla (Grunow in Van Heurck) Cleve, 1894 accepted as Gomphonema acuminatum var. pusilla Grunow in Van Heurck, 1880
Gomphonema acuminatum f. rectangulata Holmboe, 1899 (uncertain > unassessed )
Gomphonema acuminatum f. rostrata Lauby, 1910 (uncertain > unassessed )
Gomphonema acuminatum f. tenuis (Cleve-Euler) Cleve-Euler, 1955 accepted as Gomphonema elongatum var. tenuis Cleve-Euler, 1932
Gomphonema acuminatum f. trigonocephala (Ehrenberg) Cleve, 1894 (uncertain > unassessed )
Gomphonema acuminatum f. trigonocephala (Ehrenberg) Grunow in Van Heurck, 1880 accepted as Gomphonema trigonocephalum Ehrenberg, 1854
Gomphonema acuminatum f. turris Ehrenberg, 1841 (1843) (uncertain > unassessed )
Gomphonema acuminatum f. typica (Ehrenberg) Mayer, 1928 accepted as Gomphonema trigonocephalum Ehrenberg, 1854
Gomphonema acuminatum f. typica Cleve-Euler, 1955 (uncertain > unassessed )
Gomphonema acuminatum subsp. turris (Ehrenberg) Cleve
Gomphonema acuminatum var. acuminatotruncatum Filarszki, 1899 (1901) (uncertain > unassessed )
Gomphonema acuminatum var. acuminatum auct. non Grunow (uncertain > unassessed )
Gomphonema acuminatum var. acuminatum Holmboe, 1900 (uncertain > unassessed )
Gomphonema acuminatum var. americanum (Ehrenberg) Nylander, 1861 accepted as Gomphonema americanum Ehrenberg, 1840
Gomphonema acuminatum var. beta Smith (uncertain > unassessed )
Gomphonema acuminatum var. biconstricta Fontell, 1917 (uncertain > unassessed )
Gomphonema acuminatum var. biventralis (Heribaud & M. Peragallo in Heribaud) VanLandingham, 1971 accepted as Gomphonema biventralis Héribaud & M. Peragallo in Héribaud, 1902
Gomphonema acuminatum var. brasiliensis Fricke in Schmidt et al., 1902 (uncertain > unassessed )
Gomphonema acuminatum var. brebissonii (Kützing) Grunow, 1880 accepted as Gomphonema brebissonii Kützing, 1849
Gomphonema acuminatum var. capitatum (Ehrenberg) W.Carruthers (uncertain > unassessed )
Gomphonema acuminatum var. clavus (Brébisson) Grunow, 1880 accepted as Gomphonema clavus L.A.Brébisson, 1835
Gomphonema acuminatum var. constrictum (Kützing) W.Carruthers, 1864 (uncertain > unassessed )
Gomphonema acuminatum var. constrictum Akimova, 1930 (uncertain > unassessed )
Gomphonema acuminatum var. coronatum (Ehrenberg) Ehrenberg, 1864 accepted as Gomphonema coronatum Ehrenberg, 1840
Gomphonema acuminatum var. coronatum (Ehrenberg) Rabenhorst, 1864 accepted as Gomphonema coronatum Ehrenberg, 1840
Gomphonema acuminatum var. cryptoacuminatum N.Abarca & R.Jahn in Abarca et al., 2020
Gomphonema acuminatum var. cuneatum Carruthers, 1864 (uncertain > unassessed )
Gomphonema acuminatum var. curvatum Shirshov, 1937 (uncertain > unassessed )
Gomphonema acuminatum var. directa Cleve-Euler, 1932 (uncertain > unassessed )
Gomphonema acuminatum var. ellongatum (W.Sm.) Carr in J.E. Gray, 1864
Gomphonema acuminatum var. elongatum (W.Smith) G.L.Rabenhorst, 1864 accepted as Gomphonema elongatum var. elongatum W. Smith, 1855
Gomphonema acuminatum var. fusticulus (Smith) Carruthers, 1864 accepted as Gomphonema fusticulus W.Smith
Gomphonema acuminatum var. gamma W. Smith, 1853 (uncertain > unassessed )
Gomphonema acuminatum var. genuina Mayer, 1913 (uncertain > unassessed )
Gomphonema acuminatum var. gigantea Héribaud & M. Peragallo in Héribaud, 1902 (uncertain > unassessed )
Gomphonema acuminatum var. hastata (A. Cleve) F.W. Mills, 1934 accepted as Gomphonema acuminatum f. hastata A. Cleve, 1895
Gomphonema acuminatum var. hybrida Cleve-Euler, 1939 (uncertain > unassessed )
Gomphonema acuminatum var. intermedia (Dippel) Mayer, 1913 (uncertain > unassessed )
Gomphonema acuminatum var. intermedia Grunow, 1881 (uncertain > unassessed )
Gomphonema acuminatum var. laticeps (Ehrenberg) Grunow, 1880 accepted as Gomphonema laticeps Ehrenberg, 1843
Gomphonema acuminatum var. laticeps Truan y Luard, 1884 (uncertain > unassessed )
Gomphonema acuminatum var. lineare Carruthers, 1864 (uncertain > unassessed )
Gomphonema acuminatum var. longiceps (Ehrenb.) N.Abarca & R.Jahn
Gomphonema acuminatum var. longiceps (Ehrenberg) N.Abarca & R.Jahn in Abarca et al., 2020
Gomphonema acuminatum var. minutissima Héribaud, 1908 (uncertain > unassessed )
Gomphonema acuminatum var. montanum J.Schumann, 1867 (uncertain > unassessed )
Gomphonema acuminatum var. mustela (Ehrenberg) Nylander, 1861 accepted as Gomphonema mustela f. mustela Ehrenberg, 1854
Gomphonema acuminatum var. nasuta (Ehrenberg) Prochazka, 1923 accepted as Gomphonema nasutum Ehrenberg, 1843
Gomphonema acuminatum var. nasutum (Ehrenberg) Schumann, 1862 accepted as Gomphonema nasutum Ehrenberg, 1843
Gomphonema acuminatum var. obtusum Fan & Bao, 2004
Gomphonema acuminatum var. pontina Zanon, 1928 (uncertain > unassessed )
Gomphonema acuminatum var. pusilla Grunow in Van Heurck, 1880 (uncertain > unassessed )
Gomphonema acuminatum var. pusillum Grunow, 1880
Gomphonema acuminatum var. scardicum (Mitić- Kopanja, C.E.Wetzel, Ector & Levkov) N.Abarca & R.Jahn in Abarca et al. 2020
Gomphonema acuminatum var. scardicum (Mitić- Kopanja, C.E.Wetzel, Ector & Levkov) N.Abarca & R.Jahn,