| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Oxytoxum Stein 1883 | 0 | 0 | 3 |
| Paralia P. A. C. Heiberg 1863 | 1 | 0 | 0 |
| Paralia sulcata | 0 | 0 | 3 |
| Paraliaceae | 1 | 0 | 0 |
| Paraliales | 1 | 0 | 0 |
| Peridiniales | 4 | 0 | 0 |
| Planktoniella | 1 | 0 | 0 |
| Planktoniella sol | 0 | 0 | 3 |
| Pleurosigmataceae | 1 | 0 | 0 |
| Podolampadaceae | 1 | 0 | 0 |
| Podolampas Stein 1883 | 1 | 0 | 3 |
| Podolampas Stein 1883 | 0 | 0 | 3 |
| Pronoctiluca Fabre-Domergue 1889 | 2 | 0 | 0 |
| Pronoctiluca pelagica | 0 | 0 | 3 |
| Prorocentraceae | 2 | 0 | 0 |
