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Mega-spined trilobite: Acidaspis

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A fossil 'odontopleurid' trilobite, named Acidaspis, from Devonian rocks in Morocco. The spines are almost as long as the body.

These spines may well have been used in defence, to discourage predators from attacking the trilobite. Trilobites from the Cambrian Period are apparently much less specialised. Perhaps the development of early jawed fish created the need for defensive parts.