| Family | Genus | Species |
|---|---|---|
| Anablepidae | 3 | 21 |
| Aphaniidae | 6 | 98 |
| Aplocheilidae | 2 | 26 |
| Cyprinodontidae | 8 | 191 |
| Fluviphylacidae | 1 | 8 |
| Fundulidae | 4 | 59 |
| Goodeidae | 18 | 50 |
| Nothobranchiidae | 15 | 368 |
| Pantanodontidae | 2 | 1 |
| Poeciliidae | 28 | 326 |
| Procatopodidae | 13 | 48 |
| Profundulidae | 2 | 21 |
| Rivulidae | 37 | 474 |
| Valenciidae | 1 | 3 |