This is a top quality, Drotops armatus trilobite quarried near Zireg, Morocco. With somewhere around 100 free standing spines it would have been a very unappetizing dinner for it's predators.
It's 3.85" long, nicely inflated and very well prepared. All of the spines are original and the only restoration is some touchups along repaired cracks.
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 described species, filling nearly every evolutionary niche. Due in large part to a hard exoskeleton (shell), they left a excellent fossil record.