| Synonym | Author | CoL Status | Valid | Synonymy | Combination |
|---|---|---|---|---|---|
| Ephippium angulinum | Chemnitz, 1785 | ambiguous synonym | No | other |
original combination |
| Ephippium polonicum | Röding, 1798 | synonym | No | junior synonym |
original combination |
| Placenta ephippium | Philipsson, 1788 | synonym | No | senior synonym |
original combination |
| Placuna ephippium | (Philipsson, 1788) | accepted name | Yes | senior synonym |
new combination |
| Placuna papyracea | Lamarck, 1819 | synonym | No | junior synonym |
original combination |
| Placuna quadrangula | (Philipsson, 1788) | synonym | No | junior synonym |
new combination |
| Placuna sella | (Gmelin, 1791) | synonym | No | junior synonym |
new combination |