3.05" Paralejurus Trilobite - Atchana, Morocco
This is a 3.05" long (if outstretched) Paralejurus trilobite quarried at Atchana, Morocco. The shell is chocolate brown coloration and has quite a bit of detail including microscopic eye facets in both the eyes and terrace lines on the tail. There is one patch of shell restoration on the right side of the tail.
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.