Nodosaurus

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Nodosaurus
Temporal range: Late Cretaceous, 100.5–97Ma
Nodosaurus textilis.jpg
Historical restoration of a Nodosaurus textilis skeleton from 1921
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Ornithischia
Suborder: Ankylosauria
Family: Nodosauridae
Genus: Nodosaurus
Marsh, 1889
Species: † N. textilis
Binomial name
Nodosaurus textilis
Marsh, 1889

Nodosaurus (meaning "knobbed lizard") was a genus of herbivorous ankylosaurian dinosaur from the Late Cretaceous, the fossils of which are found in North America. One incomplete specimen has been discovered in the Frontier Formation of Wyoming. One of the first armored dinosaurs to be discovered in North America, Nodosaurus was named by Othniel Charles Marsh in 1889.

This nodosaurid ankylosaur was about 13 to 20 feet (4.0 to 6.1 m) long. It was an ornithischian dinosaur with bony dermal plates covering the top of its body, and it may have had spikes along its side as well. The dermal plates were arranged in bands along its body, with narrow bands over the ribs alternating with wider plates in between. These wider plates were covered in regularly arranged bony nodules, which give the animal its scientific name.[1]

It had four short legs, five-toed feet, a short neck, and a long, stiff, clubless tail. The head was narrow, with a pointed snout, powerful jaws, and small teeth.[1] It perhaps ate soft plants, as it would have been unable to chew tough, fibrous ones; or alternatively it may have processed the latter with gastroliths and its enormous intestinal apparatus.

It is thought that without a club on its tail, Nodosaurus would have been left without much in terms of active defenses. When threatened, it probably dropped to the ground so that only its armored back and sides were exposed, much like modern-day hedgehogs.

Various nodosaur scutes found in the Eastern US have a good chance of being identified as, and probably are, scutes of the genus Nodosaurus.

References[edit]

  1. ^ a b Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. pp. 158–159. ISBN 1-84028-152-9. 
  • Cretaceous Dinosaurs of the Southeastern United States, by David T. King Jr.