Ornithischia

• Kingdom: Animalia
• Phylum: Chordata
• Class: Sauropsida
• Superorder: Dinosauria
• Order: Ornithischia

Suborder: Thyreophora - (armored dinosaurs)

• Superfamily Stegosauria
• Superfamily Ankylosauria

Suborder: Ornithopoda

• Superfamily Iguanodontia

• Iguanodontidae

• Superfamily Hadrosauroidea

• Hadrosauridae - (duck-billed dinosaurs)

Suborder: Marginocephalia

• Superfamily Pachycephalosauria
• Superfamily Ceratopsia - (horned dinosaurs)