| Synonym | Author | CoL Status | Valid | Synonymy | Combination |
|---|---|---|---|---|---|
| Cymatium adairense | Dall, 1910 | synonym | No | junior synonym |
original combination |
| Cymatium gibbosum | (Broderip, 1833) | accepted name | Yes | senior synonym |
new combination |
| Tritonium gibbosum | Maltzan, 1884 | synonym | No | senior synonym |
original combination |