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More Dinosaur Fact Sheets
Allosaurus Fact Sheet
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Dinosaur/Paleontology Dictionary
NAME: Meaning - Allosaurus means "different lizard," named for its unusual vertebrae, lighter than those of other dinosaurs
Pronounced - AL-oh-SAWR-us
Named By - Othniel Marsh
When Named - 1877
DIET: Carnivore (meat-eater)- it ate plant-eating dinosaurs, like stegosaurs and iguanodonts.
SIZE: Length - about 40 ft (12 m) long
Height - 10 ft (3 m) tall at the hips
Weight - up to 4.5 tons
WHEN IT LIVED: Late Jurassic period, about 150-140 million years ago
WHERE IT LIVED: Fossils have been found in Colorado, Montana, New Mexico, Oklahoma, S. Dakota, Utah, and Wyoming, North America, in Portugal, Europe, and perhaps Tanzania, Africa and Australia.
FOSSILS: Over 60 Allosaurus fossils have been found. The first virtually complete Allosaurus skeleton was discovered by rancher M. P. Felch in 1883, in Colorado, USA
  • 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
  • Superfamily Carnosauria
  • Family Allosauridae
  • Genus Allosaurus
  • Species A. fragilis (type species named by Marsh, 1877)
Allosaurus was a top predator with a huge head, sharp, serrated teeth, short arms, and three-fingered hands.

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