Saurischia (sawr-RIS-kee-ah) is one of the two orders of dinosaurs (Ornithischia
being the other). The division is based on the shape of the pelvic bone.
The saurischian pubis juts forward, and its ischium points backward. (The
ornithischian pubis and ischium both point backward.)
The famous carnivorous dinosaurs were from the saurischian order, as were
the largest herbivorous dinosaurs. The saurischian dinosaurs include two
suborders: Theropoda and Sauropodomorpha.