This Specimen has been sold.
1.25" Scarce Tropidocoryphe Trilobite - Issoumour, Morocco
This is a fairly scarce type of Proetid trilobite (Tropidocoryphe) from Morocco. It comes from the quadrops "couche" on Mount Issoumour. This specimen is laid out nice and prone and is 1.25" in length. It's hard to come by specimens this nice of the species.
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.