This Specimen has been sold.
Morocconites & Austerops Trilobites - Ofaten, Morocco
Here are two different species of trilobites, closely associated together. There is a 2.85" Morocconites malladoides with a 1.9" Austerops next to it. The preparation is a bit rough, hence the lower price on this piece. About 5% shell restoration overall.
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.