Trilobites

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  • Trilobites
    • extinct group of invertebrates
    • The trilobite      exoskeleton has three parts
      • Cephalon (head)
      • Thorax (body)
      • Pygidium (tail)
    • Different variations can show lifestyles
      • No eyes
        • Suggests a life in deep, dark areas of the ocean
      • Smooth outline, close fitting pleurae and a scoop-shape cephalon
        • Suggests adaptations for tunneling
      • Reduce weight of exoskeleton
        • allow them to swim more easily
    • Triolbites from the lower palaeozoic, show variation in size, shape and possible adaptation
      • Silurian
        • Deiphon
          • Small lightweight exoskeleton: adapted for swimming?
      • Ordovician
        • Trinucleus
          • Small blind trilobite:deep water?
      • Cambrian
        • Paradoxides
          • Large trilobite, shows typical adaptations for life on the sea bed?
          • Zone fossil for Middle Cambrian
  • Suggests a life in deep, dark areas of the ocean

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