Dodatak:Popis sisavaca, U

Ui

Tribus †Uintaniini Szalay 1976

1. †Jemezius Beard 1987
2. †Uintanius Matthew 1915

Mammalia → Primates → Tarsiiformes → Omomyidae → Omomyinae

†Uintanius Matthew, 1915

• †Uintanius ameghini Wortman, 1904
• †Uintanius rutherfurdi Robinson, 1966

Mammalia → Primates → Tarsiiformes → Omomyidae → Omomyinae → Uintaniini

Un

, Uncia

Ur

, Uranomys , Urocitellus , Urocyon , Uroderma , Urogale

Uromys Peters, 1867

• Uromys (Cyromys) Thomas, 1910
• Uromys (Cyromys) imperator (Thomas, 1888)
• Uromys (Cyromys) porculus Thomas, 1904
• Uromys (Cyromys) rex (Thomas, 1888)
• Uromys (Uromys) Peters, 1867
• Uromys (Uromys) anak Thomas, 1907
• Uromys (Uromys) boeadii Groves and Flannery, 1994
• Uromys (Uromys) caudimaculatus (Krefft, 1867)
• Uromys (Uromys) emmae Groves and Flannery, 1994
• Uromys (Uromys) hadrourus (Winter, 1984)
• Uromys (Uromys) neobritannicus Tate and Archbold, 1935
• Uromys vika Lavery & Judge, 2017

Mammalia → Rodentia → Muroidea → Muridae , Uropsilus , Urotrichus , Ursidae , Ursus

Uz

†Uzbekbaatar Kielan-Jaworowka & Nessov, 1992

• †Uzbekbaatar kizylkumensis Kielan-Jaworowska & Nessov, 1992
• †Uzbekbaatar wardi Averianov 1999

Mammalia → Allotheria → Multituberculata → Cimolodonta