A HISTORY OF VERTEBRATES: AMPHIBIANS AND REPTILES 463 



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Figure 23.14. Representatives of the main groups of dinosaurs that flourished dur- 

 ing the late Mesozoic era. A, Tyrannosaurus, a carnivorous saurischian; B, Brontosaurus, 

 an herbivorous saurischian; C, Stegosaurus, an ornithischian; D, Triceratops, another 

 ornithischian. Brontosaurus was the largest and reached a length of about eighty feet. 

 (Courtesy of the Chicago Museum of Natural History.) 



