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Chapter 8 Key Terms
Stegosaurus and Ankylosaurs
14
Science
Undergraduate 2
12/22/2011

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Term
Ankylosauria
Definition
  • "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
Term
Ankylosauridae
Definition
  • 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
Term
armor plates
Definition
  • present in the thyreophora
  • are in the skin above or alongside the vertebral column
Term
endocast
Definition
  • 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
Term
Euplocephalus
Definition
  • Upper Cretaceous of Canada and the United States
  • typical ankylosaurid
  • medium-sized to large
  • skeleton similar to nodosaurus but more massive
  • armoured skull
Term
Gastonia
Definition
  • thyrophorean that has both ankylosaurid features and nodosaurid features

 

Term
Huayangosaurus
Definition
  • the most primitive stegosaur
  • spike shaped plates down its back not diamond
  • smaller skull than stegosauridae
Term
Nodosauridae
Definition
  • family under ankylosauria
  • narrow skulls
  • lack armor and horns at posterior corners
  • spines in armor
  • no ossified tail tendons or tail club
Term
Nodosaurus
Definition
  • 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
Term
Panoplosaurus
Definition
  • has typical nodosaur skull
  • skull is small and narrow w/ pointed snout
  • no horns or extra armour
Term
Stegosauria
Definition
  • "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
Term
Stegosauridae
Definition
  • relatively low skulls, long snouts, and posteriorly located eye sockets
  • larger size than huayangosaurus and more massive skeleton
  • relatively long hind limbs
Term
Stegosaurus
Definition

very small head

narrow, toothless beak

leaf shaped cheek teeth w/ small denticles 

no dental batteries

hoof-like feet

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