Uma
Umbravaga
Umbrivaga
Underwoodisaurus
Undetermined
Unechis
Ungaliophis
Unid Anura
Unid Bufonidae
Unid Colubridae
Unid Dendrobatidae
Unid Leptodactylidae
Unid Microhylidae
Unknown
Uperodon
Uperoleia
Uperolia
Uracentron
Uraeotyphlus
Uranoscodon
Urocentron
Urocotyledon
Uromacer
Uromacerina
Uromastix
Uromastyx
Uropeltis
Uroplatus
Urosaurus
Urostrophus
Urotheca
Uta