| Nominal Species (n = 8) | Present allocation (n = 2) | Ref. |
|---|---|---|
| Ephippium angulinum Chemnitz, 1785 | Placuna ephippium | 348 |
| Placenta ephippium Philipsson, 1788 | Placuna ephippium | 348 |
| Placenta orbicularis Philipsson, 1788 | Placuna placenta | 348 |
| Placuna ovalis Blainville, 1826 | Placuna placenta | 348 |
| Placuna papyracea Lamarck, 1819 | Placuna ephippium | 348 |
| Anomia placenta Linnaeus, 1758 | Placuna placenta | 80041 |
| Ephippium polonicum Röding, 1798 | Placuna ephippium | 348 |
| Ephippium transparens Röding, 1798 | Placuna placenta | 348 |