This Specimen has been sold.
Crotalocephalina, Reedops & Leonaspis Trilobites - Atchana, Morocco
This is an excellent, natural association of three different species of trilobites quarried near Atchana, Morocco. There is a Crotalocephalina gibbus that would be about 2.6" long if outstretched, a Reedops which is missing it's tail, and a Leonaspis that has been prepared with many of its spines free-standing. Really nice preparation work on this piece and it displays very aesthetically.
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.