| Protoperidinium sphaeroides (P.A. Dang.) Balech, 1974 |
| Protoperidinium sphaeroideum (L. Mangin) Balech, 1974 |
| Protoperidinium spiniferum (J. Schiller) Balech, 1974 |
| Protoperidinium steinii (Jørg.) Balech, 1974 |
| Protoperidinium stellatum (D. Wall) Balech, 1994 |
| Protoperidinium subcrassipes Balech, 1988 |
| Protoperidinium subinerme (Paulsen) A.R. Loebl. III, 1970 |
| Protoperidinium subpyriforme (P.A. Dang.) Balech, 1974 |
| Protoperidinium subsphaericum (Broch) Balech, 1974 |
| Protoperidinium tenuissimum (Kof.) Balech, 1974 |
| Protoperidinium thorianum (Paulsen) Balech, 1973 |
| Protoperidinium thulesense (Balech) Balech, 1973 |
| Protoperidinium tristylum (F. Stein) Balech, 1974 |
| Protoperidinium tuba (J. Schill.) Balech, 1974 |
| Protoperidinium tumidum (Okamura) Balech, 1988 |
| Protoperidinium variegatum (Peters) Balech, 1974 |
| Protoperidinium venustum (Matzen.) Balech, 1974 |
| Protoperidinium vulgare Balech, 1978 |
| Protoperidinium wiesneri (J. Schill.) Balech, 1974 |