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Dinosaur and Paleontology Dictionary |
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 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.) |
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 (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. |
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Dinosaur and Paleontology Dictionary |
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