| Synonym | Author | CoL Status | Valid | Synonymy | Combination |
|---|---|---|---|---|---|
| ! Protoperidinium steini | (Jørgensen, 1899) Balech, 1974 | synonym | No | senior synonym |
new combination |
| Protoperidinium steinii | (Jørgensen, 1899) Balech, 1974 | accepted name | Yes | senior synonym |
new combination |