| Synonym | Author | CoL Status | Valid | Synonymy | Combination |
|---|---|---|---|---|---|
| Cribroelphidium excavatum | (Terquem, 1875) | accepted name | Yes | senior synonym |
new combination |
| Elphidium clavatum | Cushman, 1930 | synonym | No | junior synonym |
original combination |
| Elphidium excavatum | (Terquem, 1875) | synonym | No | senior synonym |
new combination |
| Elphidium excavatum clavatum | Cushman, 1930 | synonym | No | senior synonym |
original combination |