Ornithischian Dinosaurs - Enchanted Learning Software

DINOSAUR SPECIES and CLASSIFICATION
Taxonomy and Cladistics	Dinosaurs		Not Dinosaurs
	Saurischian Dinosaurs	Ornithischian Dinosaurs

ORNITHISCHIAN DINOSAURS
Dinosaurs are divided into two groups based on hip structure, the Order Ornithischia and the Order Saurischia.

The Ornithischian dinosaurs had a hip structure similar to that of birds, but they were not the ancestors of birds. They outnumbered the Saurischians. The Ornithischians were vegetarian, and included two-legged, plated, armored, and horned dinosaurs.

Major divisions of the Ornithischian dinosaurs:

Ornithopods
- Two-legged walk
- No body armor
- Spiked hand
- Lived in the early Jurassic to Cretaceous
Thyreophorans ("shield bearers")
- Armored plates on the body
- Lived in the early Jurassic to Cretaceous
Ceratopsians, horned dinosaurs
- Beaked
- Lived during the Cretaceous
Pachycephalosaurs, dome-headed dinosaurs
- Huge bony skulls
- Lived during the Cretaceous

The following is a sampling of Ornithischian dinosaurs.

(Order) Ornithischia (Bird-hipped herbivores)

Ornithopoda
Iguanodontids	Hadrosauria, the Duck-billed dinosaurs
IGUANODON	MAIASAUR	PARASAUROLOPHUS

Marginocephalia
Ceratopsia (Horned dinosaurs) More about Ceratopsia		Pachycephalosauria (Thick-skulled dinos)
TRICERATOPS	MONTANO- CERATOPS	PACHYCEPHALOSAURUS	STEGOCERAS

Thyreophora = Enoplosauria
ANKYLOSAURUS	EUOPLOCEPHALUS	STEGOSAURUS

Fabrosauria = Lesothosauria

HETERODONTOSAUR (different-tooth dino)

Taxonomy and Cladistics	Dinosaurs		Not Dinosaurs
	Saurischian Dinosaurs	Ornithischian Dinosaurs

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