Dodatak:Popis gmazova, U

Ua

†Uatchitodon Sues 1991

• †Uatchitodon kroehleri Sues 1991
• †Uatchitodon schneideri Mitchell et al. 2010

Reptilia → Eureptilia → Romeriida → Diapsida → Archosauromorpha → Archosauriformes

Um

Uma Baird, 1859

• Uma exsul Schmidt & Bogert, 1947
• Uma inornata Cope, 1895
• Uma notata Baird, 1858
• Uma paraphygas Williams, Chrapliwy & Smith, 1959
• Uma rufopunctata Cope, 1895
• Uma scoparia Cope, 1894
• Uma scopifera Cope, 1894

Reptilia → Squamata → Phrynosomatidae

Un

Underwoodisaurus Wermuth, 1965

• Underwoodisaurus milii (Bory de Saint-Vincent, 1825)
• Underwoodisaurus seorsus Doughty & Oliver, 2011

Animalia → Chordata → Reptilia → Squamata → Gekkonidae

• 
  Underwoodisaurus milii
• 
  Underwoodisaurus milii

• Ungaliophis

Ur

• Uracentron
• Uranoscodon
• Urocotyledon
• Uromacer
• Uromacerina
• Uromastyx
• Uropeltidae
• Uropeltis
• Uroplatus
• Urosaurus
• Urostrophus
• Urotheca

Ut

• Uta

Uv

• Uvidicolus