Huge, 5.35" Spiny Psychopyge Trilobite - Issoumour, Morocco
This is an absolutely massive, Psychopyge elegans from Issoumour, Morocco. At 5.35" long this is near maximum size for the species and the largest one I've seen for sale. It has dozens of tiny, free-standing spines and a distinctive rostrum. Only about 2-3% restoration, mainly to the tips of a few tail spines, and touchups along repaired cracks. A beast of a trilobite.
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.