Brittle star echinoderm fossils. These are echinoderms in the class Ophiuroidea, closely related to starfish. They crawl across the sea floor using their flexible arms for locomotion. They generally have five long, whip-like arms which may reach up to 60 centimetres. This fossil dates to the late Upper Silurian period, about 450 million years ago. Found in Morocco.

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Photo credit: © PHILIPPE PSAILA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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