| Fragilariforma D.M. Williams & Round, 1988 |
| Fragilariforma bicapitata (A. Mayer) D.M. Williams & Round, 1988 |
| Fragilariforma constricta (Ehrenb.) D.M. Williams & Round, 1988 |
| Fragilariforma mesolepta (Rabenh.) Kharitonov, 2005 |
| Fragilariforma nitzschioides (Grunow) Lange-Bert., 2011 |
| Fragilariforma virescens (Ralfs) D.M. Williams & Round, 1988 |
| Fragilariforma virescens var. capitata (Østrup) Hartley, 1996 |
| Fragilariforma virescens var. elliptica (Hust.) Kharitonov, 2005 |
| Grunoviella van Heurck, 1896 |
| Grunoviella parva (Grunow) H. Perag. & M. Perag., 1897 |
| Nanofrustulum Round, Hallsteinsen & Paasche, 1999 |
| Nanofrustulum krumbeinii (Witkowski, Witak & K. Stachura) E. Morales, 2019 |
| Nanofrustulum shiloi (J.J. Lee, Reimer & McEnery) Round, Hallsteinsen & Paasche, 1999 |
| Opephora P. Petit, 1889 |
| Opephora americana M.Peragallo, 1909 |
| Opephora krumbeinii A. Witkowski, Witak, & K. Stachura apud Lange-Bert. & S.I. Genkal, 1999 |
| Opephora marina (W. Greg.) P. Petit, 1889 |
| Opephora mutabilis (Grunow) Sabbe & Wyverman, 1995 |
| Opephora olsenii Möller, 1950 |
| Opephora pacifica (Grunow) Petit, 1889 |