Gomphonema acuminatum Ehrenberg, 1832
Gomphonema angustatum (Kützing) Rabenhorst, 1864 (uncertain > unassessed )
Gomphonema angustatum var. angustatum accepted as Gomphonema angustatum (Kützing) Rabenhorst, 1864
Gomphonema arcticum Grunow, 1880 (uncertain > unassessed )
Gomphonema curvatum Kützing, 1833 accepted as Rhoicosphenia abbreviata (C.Agardh) Lange-Bertalot, 1980
Gomphonema curvatum var. marinum Kützing, 1844 (uncertain > unassessed )
Gomphonema groenlandicum E.V.Østrup, 1895 accepted as Pseudogomphonema groenlandicum (Østrup) L.K.Medlin, 1986 accepted as Gomphonema groenlandicum var. groenlandicum Østrup, 1895
Gomphonema groenlandicum var. groenlandicum Østrup, 1895 (uncertain > unassessed )
Gomphonema lanceolatum C.Agardh, 1831 (uncertain > unassessed )
Gomphonema marinum (Kützing) W.Smith, 1853 accepted as Gomphonema curvatum var. marinum Kützing, 1844
Gomphonema septentrionale Østrup, 1895 accepted as Pseudogomphonema septentrionale (Østrup) L.K.Medlin, 1986 accepted as Gomphonema septentrionale var. septentrionale Østrup, 1895
Gomphonema septentrionale var. septentrionale Østrup, 1895 (uncertain > unassessed )
Gomphonema truncatum Ehrenberg, 1832
Gomphonema truncatum var. truncatum Ehrenberg, 1832 (uncertain > unassessed )
Gomphonema vitreum Grunow, 1878 (uncertain > unassessed )