| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Ursidae | 1 | 0 | 0 |
| Ursus Linnaeus 1758 | 2 | 0 | 0 |
| Ursus americanus Pallas 1780 | 0 | 0 | 1 |
| Ursus maritimus Phipps 1774 | 0 | 0 | 1 |
| Usbekistania Suleymanov 1960 | 1 | 0 | 0 |
| Usbekistania charoides | 0 | 0 | 1 |
| Usnea | 1 | 0 | 0 |
| Usnea sphacelata | 0 | 0 | 1 |
| Uvigerinidae | 1 | 0 | 0 |
| Vaginulinidae | 2 | 0 | 0 |
| Vaginulinopsis | 1 | 0 | 0 |
| Vaginulinopsis tasmanica | 0 | 0 | 1 |
| Valvatida Perrier 1884 | 4 | 0 | 0 |
| Valvulineria Cushman 1926 | 1 | 0 | 0 |
| Valvulineria arctica Green 1959 | 0 | 0 | 1 |
