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ZoomDinosaurs.com
Dinosaur and Paleontology Dictionary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Click on an underlined word for more information on that subject.
If the dinosaur or paleontology term you are looking for is not in the dictionary, please e-mail us.

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
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.)


URANIUM 235

Uranium 235 is a radioactive element; over time, it gradually changes into the element lead. It can be used to date very old rock layers.
Utahraptor

UTAHRAPTOR

(pronounced YOO-tah-RAP-tor) Utahraptor was a large, terrifying predator with 9-inch-long toe claws. This early dromaeosaurid dinosaur was about 16-23 feet (5-7 m) long and dates from the mid-Cretaceous period, about 125 million years ago. Fossils of this meat-eater were found in eastern Utah, USA in 1991. The type species is U. ostrommaysi.

ZoomDinosaurs.com
Dinosaur and Paleontology Dictionary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Click on an underlined word for more information on that subject.
If the dinosaur or paleontology term you are looking for is not in the dictionary, please e-mail us.

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