We offer a variety of authentic trilobite fossils for purchase in wholesale lots in addition to our selection of high quality trilobites sold individually. These are all real trilobite fossils and are great for resale, gifts of educational purposes. Please contact us if you have any questions or special requests. Trilobites were a very diverse group of extinct marine arthropods. They first appeared in the fossil record in the Early Cambrian (521 million years ago) and went extinct during the Permian mass extinction (250 million years ago).