evolved in the Cambrian + became extinct at the end of the Permian.
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Exoskeleton
made of chitin; provides protection and support; provides attachment for muscles; may have had sensory hairs emerging from the exoskeleton to detect chemicals
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Exoskeleton Morphology
made up of 3 layers. A waxy outer layer and 2 further layers of chitin and protein. The middle layer may be impregnated with calcium carbonate for increased strength
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