SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Trilobite fossil. Fossilised Isotelus sp. trilobite. This trilobite lived during the Ordovician period (around 505-440 million years ago). The trilobites are an extinct group of marine invertebrates with a hard, segmented shell that is divided into 3 sections. The Isotelus group possessed a rounded head and tail, as seen here. Most trilobites were bottom dwellers, feeding on organic sediment on the ocean floor. Many could roll themselves into a ball when threatened, ensuring that only the hard shell was exposed to attackers. Found in Morocco.
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