| Fragilaria capucina var. vaucheriae (Kütz.) Lange-Bert., 1980 |
| Fragilaria constricta Ehrenb., 1843 |
| Fragilaria construens (Ehrenb.) Grunow, 1862 |
| Fragilaria crotonensis Kitton, 1869 |
| Fragilaria crotonensis var. oregona H.E.Sovereign, 1958 |
| Fragilaria diophthalma Hemprich & Ehrenb., 1831 |
| Fragilaria dorsiventralis (O. Müll.) Lange-Bert., 1980 |
| Fragilaria dzonoticola E. Novelo, R. Tavera & C. Ibarra, 2007 |
| Fragilaria exigua Grunow, 1882 |
| Fragilaria famelica (Kütz.) Lange-Bert., 1980 |
| Fragilaria fragilarioides (Grunow) Cholnoky, 1963 |
| Fragilaria goulardii (Bréb. ex Grunow) Lange-Bert., 2001 |
| Fragilaria gracilis Østrup, 1910 |
| Fragilaria granulata G. Karst., 1907 |
| Fragilaria hyalina (Kütz.) Grunow ex Van Heurck, 1862 |
| Fragilaria incisa (C.S.Boyer) Lange-Bert., 1980 |
| Fragilaria intermedia (Grunow) Grunow, 1881 |
| Fragilaria islandica Grunow ex Van Heurck, 1881 |
| Fragilaria lapponica Grunow, 1881 |
| Fragilaria mesolepta Rabenhorst, 1861 |