CARNIVOROUS DINOSAURS 



211 



ANCHISAURUS 



RHYTIDODON 



CONNECTICUT TRJASSIC REPTILES 



Fig. 88. Life of the Connecticut Ri\ er Valley in Upper Triassic (Newark) Time. 



Anchisaurus, a primitive carnivorous bipedal dinosaur. Rhytidodon, a phytosaur analo- 

 gous but not related to the modern gavials. Stegomus, a small armored phytosaur 

 related to Rhytidodon. Anomospus, a herbivorous bipedal dinosaur related to the 

 "duckbills" or Iguanodonts. Podokcsaurus, a light, swift-moving, carnivorous dino- 

 saur of the bird-like type. Restorations (except Rhytidodon) after R. S. Lull of Yale 

 University. Drawn to uniform scale for the author by Richard Deckert. 



Fig. 



Terrestrial Evolution of the Dlnosaurs. 



The ancestral tree of the dinosaurs, originating in Lower Permian time, and branching 

 into five great lines during a period estimated at twelve million years. A , The giant 

 herbivorous Sauropoda which sprang from Lower Triassic carnivorous ancestors. 



B, Giant carnivorous dinosaurs, which prey upon all the larger herbivorous forms. 



C, Swift-moving, ostrich-like, carnivorous dinosaurs, related to B. D, Herbivorous 

 Iguanodonts, swift-moving, beaked, or "duck-bill" dinosaurs, related to E. E, Slow- 

 moving, quadrupedal, heavily armored or horned herbivorous dinosaurs, related to D. 

 Prepared for the author by W. K. Gregory, chiefly after Lull. 



