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Allosaurus: Facts About the 'Different Lizard' | LiveScience

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Allosaurus: Facts About the 'Different Lizard'
Kim Ann Zimmermann, LiveScience Contributor | November 15, 2012 04:38pm ET

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Allosaurus was among the earliest dinosaur discoveries, and fossils are plentiful, making it a darling of paleontologists as well as amateur dinosaur observers.
This large theropod lived 155 million to 150 million years ago during the late Jurassic Period. More than 10,000 bones from about 46 specimens have been unearthed in the Cleveland-Lloyd Quarry in Utah, making the Allosaurus the most commonly discovered fossil in Utah. It is also Utah's state fossil. Allosaurus fossils have also been discovered in Thailand as well as in Portugal and other parts of Europe. Possible Allosaurus fossils have been discovered in Africa and Australia.

Allosaurus Skeletal Reconstruction
Credit: © Scott Hartman / All rights reservedView full size image

Seven species of Allosaurus have been identified, Allosaurus fragilis being the best-known. There is some debate about whether there are more species or whether the specimens in question belong to other genera.

The name Allosaurus is derived from the Greek allos ("different" or "other") and sauros ("lizard"). One feature that makes this dinosaur "different" is its unusual vertebrae. It had nine vertebrae in its neck, 14 in the back and five supporting its hips. There were hollow spaces in the neck and anterior back vertebrae. Such spaces, which are
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