MAJOR CHARACTERISTICS OF THE ORNITHISCHIA

(modified from Weishampel et al., 1990 and Fastovsky & Weishampel, 1996)

 

1) Opisthopubic pelvis (pubis points posteroventrally)

2) Predentary bone

3) Jaw joint below occusal plane

4) Teeth leaf shaped

5) Antorbital fenestra reduced or completly closed

6) Ossified tendon running along vertebral spine

7) Five or more sacral vertebrae

8) Palpebral bone in orbit

9) Pronounced coronoid process

10) Gastralia absent