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More Dinosaur Fact Sheets
Nothronychus Fact Sheet
Dinosaur/Paleontology Dictionary
NAME: Meaning - Nothronychus means "Slothful claw""
Pronounced - no-thron-EYE-kus
Named By - James I. Kirkland and Douglas G. Wolfe
When Named - 2001
DIET: Herbivore (plant-eater) - this is unusual for a theropod
SIZE: Length - 14.5-19.5 ft (4.5-6 m) long
Height - ?
Weight - 900 kg
WHEN IT LIVED: Late Cretaceous period, about 90 million years ago
WHERE IT LIVED: Fossils have been found at the Moreno Hill Formation, Haystack Butte in the southern Zuni Basin, Catron County, New Mexico, USA, North America.
FOSSILS: About 40 to 60 percent of a composite skeleton formed from two individuals has been found.
  • Kingdom Animalia (animals)
  • Phylum Chordata (having a hollow nerve chord ending in a brain)
  • Class Archosauria (diapsids with socket-set teeth, etc.)
  • Order Saurischia - lizard-hipped dinosaurs
  • Suborder Theropoda - bipedal carnivores
  • Tetanura - advanced theropods with three fingers
  • Infraorder Coelurosauria - lightly-built fast-running predators with hollow bones and large brains
  • Family Therizinosauria - strange theropods with a toothless beak, a bird-like hip (more like ornithischians than saurischians!), and four-toed feet, wit all four toes facing forward
  • Genus Nothronychus
  • Species N. mckinleyi (type species named by James I. Kirkland and Douglas G. Wolfe vide Stanley, 2001)
Nothronychus was a very strange dinosaur that had 4-inch (10 cm) long curved finger claws similar to those of sloths. This dinosaur walked on two legs. It had long arms, a long neck, a small head, a toothless beak, leaf-shaped cheek teeth, and a short tail. Although no feather imprints or fossils have been found, relatives of Nothronychus did have feathers.

Nothronychus lived in swampy forests.

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