Unit5 Dinosaurs

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Saurischia - Sauropoda

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Diplodocus

  • Herbivore common in the Jurassic and the Cretaceous
  • Long slender skull
  • Long neck carried parallel to the ground
  • Peg-like teeth found towards the front of the jaw, to strip leaves off branches
  • Swallowed stones (gastroliths) to break down vegetation in the digestive system
  • Whip-like tail used:
    • as counter balance,
    • for communication or 
    • for defence
  • Adults moved in packs of 30 and had no natural predators
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Saurischia - Therapoda

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Tyrannosaurus

  • Carnivore common in the late cretaceous
  • Was probably a scavenger as well as a predator (opportunist)
  • Small eyes in terms of body size, poor vision
  • Tail used as counter balance for head
  • Small arms allow for a large mouth whilst still allowing it to balance on hind legs
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Ornithischia - Ornithopoda

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Iguanodon

  • Herbivore common in the late Jurassic
  • Would become bibedal to run or rear up and swing it's spike-like thumb in defence
  • Tail used as counter balance when quadrupedal
  • Toothless beak used to crop vegetation
  • Leaf-shaped cheek teeth (resembling iguana teeth) used to mince it's food
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Evolution of Birds

(http://www.enchantedlearning.com/agifs/Archaeopteryx_bw.GIF)

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Evolution of Birds

  • Birds are thought to have evolved from Therapod dinosaurs in the Jurassic
  • The first birds had many skeletal similarities to coelurosaurs (a type of therapod)
    • Similarities include:
      • Hollow thin-walled bones (to make bones lighter)
      • S-shaped curved neck
      • Elongated arms and forelimbs, with clawed hands
      • The pubis shifted to a backwards position
      • Large eye sockets in the skull
      • Hinged ankles (reduces rotation of the ankle)
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