Trilobites
- Created by: Mellissa True
- Created on: 11-02-13 11:02
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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
- No eyes
- Triolbites from the lower palaeozoic, show variation in size, shape and possible adaptation
- Silurian
- Deiphon
- Small lightweight exoskeleton: adapted for swimming?
- Deiphon
- Ordovician
- Trinucleus
- Small blind trilobite:deep water?
- Trinucleus
- Cambrian
- Paradoxides
- Large trilobite, shows typical adaptations for life on the sea bed?
- Zone fossil for Middle Cambrian
- Paradoxides
- Silurian
- Suggests a life in deep, dark areas of the ocean
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