Crotalocephalus Trilobite in MatrixTrilobites are extinct hard shelled marine arthropods with amazingly great diversity. It is estimated there were over 15,000 known species of Trilobite, making them the most diverse animal life form that ever existed on earth. In Morocco, new Trilobite specimens are being discovered every year. Trilobites are important as paleo zoic guide fossils, having existed for over 270 million years. They began their existence during the early Cambrian time