This Specimen has been sold.
1.18" Wide Enrolled Pedinopariops (Phacops) Trilobite
This is a Pedinopariops (Phacops) trilobite enrolled into a defensive position. It has been cleaned with air abrasives and is completely free of the surrounding matrix. Good preservation on this example which is nicely prepared with clear eye facets.
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). They were one of the most successful of the early animals on our planet with over 25k currently described species, filling nearly every evolutionary niche. Due in large part to a hard exoskeleton (shell), they left an excellent fossil record.