| Synonym | Author | CoL Status | Valid | Synonymy | Combination |
|---|---|---|---|---|---|
| Anomia placenta | Linnaeus, 1758 | synonym | No | senior synonym |
original combination |
| Ephippium transparens | Röding, 1798 | synonym | No | junior synonym |
original combination |
| Placenta orbicularis | Philipsson, 1788 | synonym | No | junior synonym |
original combination |
| ! Placuma placenta | unidentified | synonym | No | senior synonym |
other |
| Placuna lincolnii | (non Gray, 1849) | misapplied name | No | misidentification |
misapplied |
| Placuna ovalis | Blainville, 1826 | synonym | No | junior synonym |
original combination |
| Placuna placenta | (Linnaeus, 1758) | accepted name | Yes | senior synonym |
new combination |