| Synonym | Author | CoL Status | Valid | Synonymy | Combination |
|---|---|---|---|---|---|
| Chasmagnathus subquadrata | Dana, 1851 | synonym | No | senior synonym |
original combination |
| ! Chasmagnathus subquadratus | Dana, 1851 | synonym | No | senior synonym |
original combination |
| Helice leachii | Hess, 1865 | synonym | No | junior synonym |
original combination |
| Pseudohelice subquadrata | (Dana, 1851) | accepted name | Yes | senior synonym |
new combination |