| Petrodictyon D.G. Mann, 1990 |
| Petrodictyon gemma (Ehrenb.) D.G. Mann, 1990 |
| Plagiodiscus Grunow & Eulenstein, 1867 |
| Plagiodiscus nervatus Grunow, 1867 |
| Pyxidicula Ehrenb., 1833 |
| Pyxidicula cruciata Ehrenb., 1843 |
| Rhopalodia O.F. Müll., 1895 |
| Rhopalodia acuminata Krammer, 1987 |
| Rhopalodia brebissonii Krammer, 1987 |
| Rhopalodia constricta (W. Sm.) Krammer, 1987 |
| Rhopalodia gibba (Ehrenb.) O. Müll., 1895 |
| Rhopalodia gibba var. gibba (Ehrenb.) O.F. Müll., 1895 |
| Rhopalodia gibba var. minuta Krammer, 1987 |
| Rhopalodia gibba var. ventricosa (Kütz.) H. Perag. & M. Perag., 1900 |
| Rhopalodia gibberula (Ehrenb.) O. Müll., 1895 |
| Rhopalodia gibberula var. baltica O. Müll., 1899 |
| Rhopalodia gibberula var. constricta (W. Sm.) Cleve-Euler, 1952 |
| Rhopalodia gibberula var. gibberula (Ehrenb.) O.F. Müll., 1895 |
| Rhopalodia gibberula var. margaritifera (Rabenhorst) Fricke, 1905 |
| Rhopalodia gibberula var. musculus (Kütz.) Muschler, 1908 |