| Oestrupia powellii (Lewis) Heiden, 1906 |
| Oestrupia powellii var. vidovichii (Grunow) Heiden, 1906 |
| Pinnularia Ehrenb., 1843 |
| Pinnularia abaujensis (Pantocsek) R.Ross, 1947 |
| Pinnularia abaujensis var. linearis (Hust.) R.M. Patrick, 1966 |
| Pinnularia abaujensis var. rostrata (Patrick) R.M. Patrick, 1966 |
| Pinnularia abaujensis var. subundulata (Ant. Mayer) R.M. Patrick, 1966 |
| Pinnularia acidicola Van de Vijver & R. Le Cohu, 2002 |
| Pinnularia acoricola Hust., 1934 |
| Pinnularia acrosphaeria W.Smith, 1853 |
| Pinnularia acuminata W. Sm., 1853 |
| Pinnularia acuta W. Sm., 1853 |
| Pinnularia acutobrebissonii Kulikovskiy, Lange-Bert. & Metzeltin, 2010 |
| Pinnularia aestuarii Cleve, 1895 |
| Pinnularia altiplanensis Lange-Bert., Krammer & Rumrich, 2000 |
| Pinnularia ambigua Cleve, 1895 |
| Pinnularia amphioxys Ehrenb., 1843 |
| Pinnularia anglica Krammer, 1992 |
| Pinnularia angustistriata Metzeltin & Krammer, 1998 |
| Pinnularia appendiculata (C. Agardh) Schaarschmidt, 1881 |