The discovery may push back the emergence of the reptiles that once ruled the Earth, and clarify how dinosaurs like the Triceratops and Stegosaurus emerged. The discovery may push back the emergence of the reptiles that once ruled the Earth, and clarify how dinosaurs like the Triceratops and Stegosaurus emerged. Dinosaurs, Paleontology, Fossils, Brazil, Reptiles, Research, Gondwana Research (Journal), your-feed-science NYT > Science