Glossary Menu

• Glossary A
• Glossary B
• Glossary C
• Glossary D
• Glossary E
• Glossary F
• Glossary G
• Glossary H
• Glossary I
• Glossary J
• Glossary K
• Glossary L
• Glossary M
• Glossary N
• Glossary O
• Glossary P
• Glossary Q
• Glossary R
• Glossary S
• Glossary T
• Glossary U
• Glossary V
• Glossary W
• Glossary X
• Glossary Y
• Glossary Z

Dinosaur Content

• Dinosaur List
• Dinosaurs by Category
• Dinosaur Discoveries
• Dinosaur Anatomy
• Dinosaur Classification
• Dinosaur Extinction
• Museums
• Dinosaur Articles
• Dinosaur News
• Dinosaur Videos

Geologic Timeline

• Before the Dinosaurs
• Age of Dinosaurs

Prehistoric Reptiles

• Marine Reptiles
• Land Reptiles
• Flying Reptiles

Fun Links

• PD Blog
• Game Talk
• Wordsearch Games
• Quizzes
• Kids Club

Miscellaneous Links

• Disclaimer Page
• Classifieds Page
• External Links
• Link Exchange

Homepage > Glossary U

UINTASAURUS
(pronounced you-IN-tah-SAWR-us) Uintasaurus (meaning "Uinta {County in Utah, USA where it was found} lizard") is a dinosaur which is now known to be Camarasaurus lentus. Uintasaurus was named by in 1919 by Holland. The type species is U. douglassi.

UINTATHERIUM
(pronounced you-IN-tah-THEER-ee-um) Uintatherium was a huge, rhinoceros-like mammal (not a dinosaur) from the Eocene in North America; it has no living descendants. Uintatherium was 13 feet (4 m) long and weighed about 2.25 tons (2 tonnes). It had 3 pairs of bony knobs protruding from its snout and a very small brain. Males had large, downwards-pointing canine teeth. It walked on 4 thick legs and had elephant-like feet. This herbivore lived in forests and ate leaves and soft plants. It may have been preyed upon by packs of the wolf-like Synoplotherium.

ULNA
The ulna is one of the two arm bones (the other is the radius).

ULTRASAUROS
(pronounced UL-trah-SAWR-os) Ultrasauros (a dubious genus) was a huge, long-necked, long-tailed sauropod dinosaur from the Jurassic Period. It may actually be a Brachiosaurus plus a Supersaurus fossild found together.

ULTRASAURUS
Ultrasaurus (meaning "ultra lizard") was a sauropod dinosaur from the late Cretaceous Period. It was a long-necked, long-tailed plant-eater with a small head. Fossils have been found in South Korea. Ultrasaurus was named by Kim in 1973; it is a dubious name. The type species is U. tabriensis.

UNENLAGIA
(pronounced oon-en-LAHG-ee-ah) Unenlagia was a bird-like dinosaur from the mid-cretaceous period.

UNGUAL PHALANGES
Ungual phalanges are the terminal (end) finger or toe bones (phalanges). Attached to the ungual phalanges are often claws, talons, hooves, or nails.

UNGULIGRADE
Unguligrade means walking on hoofed feet. Horses, deer, pigs, and many other mammals are unguligrade. (Compare with plantigrade and digitigrade.)

Utahraptor
This medium sized two-legged carnivore lived in the Early Cretaceous period. It was a very large member of the dromaeosaur family distinguished by their large foot claws. It may have hunted in packs on open plains. It was one of the most intelligent and dangerous of the dinosaurs.