| Gomphoneis Cleve, 1894 |
| Gomphoneis clevei (Fricke) Gil, 1989 |
| Gomphonella Rabenh., 1853 |
| Gomphonella olivacea (Hornem.) Rabenh., 1853 |
| Gomphonema Ehrenb., 1832 |
| Gomphonema abbreviatum C. Agardh, 1831 |
| Gomphonema acidoclinatum Lange-Bert. & Reichardt, 2004 |
| Gomphonema acuminatum Ehrenb., 1832 |
| Gomphonema acuminatum var. acuminatum Ehrenb., 1832 |
| Gomphonema acuminatum var. clavus (Bréb.) Grunow, 1880 |
| Gomphonema acuminatum var. constrictum (Kütz.) Carruthers, 1864 |
| Gomphonema acuminatum var. intermedium Grunow, 1881 |
| Gomphonema affine Kütz., 1844 |
| Gomphonema affine var. rhombicum E. Reichardt, 1999 |
| Gomphonema amoenum Lange-Bert., 1985 |
| Gomphonema anglicum Ehrenb., 1843 |
| Gomphonema angustatum (Kütz.) Rabenh., 1864 |
| Gomphonema angustum C. Agardh, 1831 |
| Gomphonema angustum var. lunatum (H.Germain) M. Aboal, 2003 |
| Gomphonema apicatum Ehrenb., 1854 |