This is a rare Psychopyge termierorum collected near Mrakib, Morocco. It's related to the more frequently seen Psychopyge elegans which comes from Issimour but has a much longer rostrum. The specimen including it's extended rostrum (which is natural) is 3.7" long. Great eye facet detail in both eyes and nice preparation.
The tips of a few tail spines on the right hand side have been restored and the left genal spine maybe a composite but it's hard to tell for sure. The price is significantly reduced because of this.
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.