1. Education
You can opt-out at any time. Please refer to our privacy policy for contact information.




Staurikosaurus (Dmitri Bogdanov)


Staurikosaurus (Greek for "Southern Cross lizard"); pronounced STORE-rick-oh-SORE-us


Forests and scrublands of South America

HIstorical Period:

Middle Triassic (about 230 million years ago)

Size and Weight:

About 6 feet long and 75 pounds



Distinguishing Characteristics:

Long, thin head; slender arms and legs; five-fingered hands


About Staurikosaurus:

Known from a single fossil specimen discovered in South America in 1970, Staurikosaurus was one of the first dinosaurs, the immediate descendants of the two-legged archosaurs of the early Triassic period. Like its slightly bigger South American cousins, Herrerasaurus and Eoraptor, it seems that Staurikosaurus was a true theropod--that is, it evolved after the ancient split between ornithischian and saurischian dinosaurs.

One odd feature of Staurikosaurus is a joint in its lower jaw that apparently allowed it to chew its food backwards and forwards, as well as up and down. Since later theropods (including raptors and tyrannosaurs) didn't possess this adaptation, it's likely that Staurikosaurus, like other early meat-eaters, lived in a stark environment that forced it to extract the maximum nutritional value from its wriggling meals.


  1. About.com
  2. Education
  3. Dinosaurs
  4. Types of Dinosaurs
  5. Carnivorous Dinosaurs A to Z
  6. Staurikosaurus

©2014 About.com. All rights reserved.