• "fused lizards"
• medium to large sized, quadrupedal, planteating ornithischians
• small heads w/ leaf-shaped, non-interlocking teeth
• broadly arched ribs and wide body
• covered with small round or square armor

• wide armored heads w/ triangular horns
• last few tail vertebrae were braced by ossified tendons
• tail bore a club made up of two small and two large plates

• present in the thyreophora
• are in the skin above or alongside the vertebral column

• a cast replica of the inside of the dinosaur's braincase
• normally filled with rubber (latex)
• accurately shows shape, size, and major nerves and blood vessels

• Upper Cretaceous of Canada and the United States
• typical ankylosaurid
• medium-sized to large
• skeleton similar to nodosaurus but more massive
• armoured skull

• thyrophorean that has both ankylosaurid features and nodosaurid features

• the most primitive stegosaur
• spike shaped plates down its back not diamond
• smaller skull than stegosauridae

• family under ankylosauria
• narrow skulls
• lack armor and horns at posterior corners
• spines in armor
• no ossified tail tendons or tail club

• typical of the Nodosauridae family
• Upper Cretaceous of Wyoming and Kansas
• skull has not beed disovered
• leaf-shaped teeth and toothless beak
• no dental battery

• has typical nodosaur skull
• skull is small and narrow w/ pointed snout
• no horns or extra armour

• "plated lizards"
• medium to large-sized, quadrupedal, herbivorous ornithischians
• vertical bony plates and spines arranged in single or double rows along neck, back, and tail

• relatively low skulls, long snouts, and posteriorly located eye sockets
• larger size than huayangosaurus and more massive skeleton
• relatively long hind limbs

very small head

narrow, toothless beak

leaf shaped cheek teeth w/ small denticles 

no dental batteries

hoof-like feet

• "shield bearers"
• diverse group of armored, primarily quadrupedal ornithischians of Jurassic and Cretaceous age
• world-wide distribution