| Protoperidinium pentagonum (Gran) Balech, 1974 |
| Protoperidinium poucheti (Kof. & J.R. Michener) W.R. Taylor & Balech, 1988 |
| Protoperidinium pouchetii (Kof. & Michener) Taylor & Balech, 1988 |
| Protoperidinium pulvisculus Ehrenb., 1840 |
| Protoperidinium punctulatum (Paulsen) Balech, 1974 |
| Protoperidinium pyriforme (Paulsen) Balech, 1974 |
| Protoperidinium pyriforme var. breve (Paulsen) Balech, 1988 |
| Protoperidinium pyrum (Balech) Balech, 1974 |
| Protoperidinium quadridens Stein, 1883 |
| Protoperidinium quarnerense (Schröd.) Balech, 1974 |
| Protoperidinium quinquecorne (T.H. Abé) Balech, 1974 |
| Protoperidinium rectum (Kof.) Balech, 1974 |
| Protoperidinium retiferum (Matzen.) Balech, 1974 |
| Protoperidinium robustum (Meunier) Hernández-Becerril, 1991 |
| Protoperidinium roseum (Paulsen) Balech, 1974 |
| Protoperidinium schilleri (Paulsen) Balech, 1974 |
| Protoperidinium simulum (Paulsen) Balech, 1974 |
| Protoperidinium solidicorne (L. Mangin) Balech, 1974 |
| Protoperidinium solidicorne f. makronyx J. Schill., 1929 |
| Protoperidinium sphaericum (J. Murray & Whitting) Balech, 1974 |