Herrerasaurus (huh-RARE-ah-SAWR-us) (meaning "Herrera's lizard;" Victorino Herrera was a rancher who discovered the fossil) was a late Triassic archosaur (a reptile that was almost a dinosaur) from about 230 million years ago. It used to be thought to be a very early dinosaur and a primitive prosauropod. It was a speedy bipedal carnivore about 17 feet long, weighing roughly 440-780 pounds. It had a short neck and a large head. Three partial skeletons were found in Argentina, South America. This genus was named in 1963 by O. A. Reig from a specimen found in 1958. The type species is H. ischigualastensis (the species name is from the Ischigualasto Formation of northwestern Argentina, where the fossil was found).
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