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Dinosaurs are classified into two orders based upon differences in pelvic structure: ''Saurischia'' ("lizard-hipped"), in which the ''pubis'' is pointed forward and down; and ''Ornithischia'' ("bird-hipped"), in which the ''pubis'' is pointed towards the rear.
Dinosaurs are classified into two orders based upon differences in pelvic structure: ''Saurischia'' ("lizard-hipped"), in which the ''pubis'' is pointed forward and down; and ''Ornithischia'' ("bird-hipped"), in which the ''pubis'' is pointed towards the rear.
===''Saurischia''===
===''[[Saurischia]]''===
Herbivorous species were almost all quadrupedal. They carried peg-like teeth which cut, rather than chewed, plant material; grinding of food was aided by gastroliths. Carnivorous species were exclusively bipedal.
Herbivorous species were almost all quadrupedal. They carried peg-like teeth which cut, rather than chewed, plant material; grinding of food was aided by gastroliths. Carnivorous species were exclusively bipedal.
*Sauropoda
*Sauropoda
:::''[[Giganotosaurus]]''
:::''[[Giganotosaurus]]''
===''Ornithischia''===
===''[[Ornithischia]]''===
Species of this group were all herbivorous; most were quadrupedal. Front teeth were lacking, while a predentary bone was present in the front of the lower jaw. Several species (mainly within ''Ceratopsia'') had a distinctive parrot-like beak.
Species of this group were all herbivorous; most were quadrupedal. Front teeth were lacking, while a predentary bone was present in the front of the lower jaw. Several species (mainly within ''Ceratopsia'') had a distinctive parrot-like beak.
*Ceratopsia
*Ceratopsia