Pisanosaurus

About Pisanosaurus Pisanosaurus is a small but very important Dinosaur. Many paleontologists believe that Pisanosaurus was the first member of the group Ornithischia, or one of the two main groups of Dinosaurs. This suggests that Pisanosaurus may have been the direct ancestor of many different Dinosaurs spanning 150 million years. Pisanosaurus was a small plant eating dinosaur. Its agile body allowed it to run quickly from predators.