Trilobite fossil Fossilised Solenopeltis buchi trilobite This trilobite lived during the Ordovician period around million years ago The trilobites are an extinct group of marine arthropods with a hard segmented shell that is divided into sections S buchi possessed long spines which protruded from the segments of its thorax left and right Most trilobites were bottom dwellers feeding either on organic sediment on the ocean floor or by catching their own prey Many could roll themselves into a ball when threatened ensuring that only the shell was exposed to attackers Found in Morocco