| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Upupidae (hoopoes) | 1 | 0 | 0 |
| Uraspis | 1 | 0 | 0 |
| Uraspis helvola (Forster 1801) (Whitemouth Jack) | 0 | 0 | 1 |
| Uromastyx Merrem 1820 | 1 | 0 | 0 |
| Uromastyx Merrem 1820 | 0 | 0 | 1 |
| Uromastyx thomasi Parker 1930 (Omani Spiny-tailed Lizard) | 0 | 0 | 1 |
| Uropodidae (tortoise mites) | 2 | 0 | 0 |
| Ustilaginaceae | 1 | 0 | 0 |
| Ustilaginales | 1 | 0 | 0 |
| Ustilaginomycetes | 1 | 0 | 0 |
| Ustilago | 1 | 0 | 0 |
| Ustilago bornmuelleri Magnus 1896 | 0 | 0 | 1 |
| Valenciennea (Sleeper Gobies) | 1 | 0 | 0 |
| Valenciennea Bleeker 1856 | 0 | 0 | 1 |
| Valenciennea persica Hoese & Larson 1994 | 0 | 0 | 1 |
