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August Fossil of The Month Trilobite Trilobite, meaning three-lob, are extinct marine arthropods (same phylum as insects). They are one of the earliest known arthrpods. We first find them in the Early Cambrian period, that over 500 million years ago! They are found throughout the Paleozoic era and began to decline during the Devonian. The appear to have all become extinct about 250 million years ago. They were however, just about the most successful of all the early animals during their reign. There are several types of trilobites and they were geographically dispersed. Because trilobites had wide diversity and were easily fossilized due to their exoskeleton, there is a log of fossils to be found. It is estimated that over 17,000 species existed throughout time. Some trilobites appear to have been predators, some scavenger, some filter feeders - they did just about everything that marine arthropods do today!