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Travels with Trilobites Country & Western music Canine Sports Medicine and RehabilitationTrilobites were some of the most successful and versatile organisms ever to exist. Among the earliest forms of complex animal life, these hard shelled marine invertebrates inhabited the primal seas of the Paleozoic Era. Their march through evolutionary time began in the Lower Cambrian, some 521 million years ago, and lasted until their demise at the end of the Permian, more than 250 million years later. During this vast stretch of planetary history,