Dodatak:Abecedni popis diapsida: U
Ua uredi
†Uatchitodon Sues 1991 uredi
- †Uatchitodon kroehleri Sues 1991
- †Uatchitodon schneideri Mitchell et al. 2010
Diapsida → Archosauromorpha → Archosauriformes
Um uredi
- Umoonasaurus Kear, Schroeder & Lee, 2006 †
Ur uredi
- Uralosaurus,
- Uromasticini
- Uromastycinae,
- Uromastyx,
- Uronautes Cope, 1876 †
- Uronautes,
- Urosaurus,
- Uruguaysuchidae †
- Uruguaysuchus †
Ut uredi
- Uta,
- Utahdactylus
- Utatsusauridae McGowan & Motani, 2003 †
- Utatsusaurus Shikama, Kamei & Murata, 1978 †