This Specimen has been sold.
3.1" Crotalocephalina Trilobite - Atchana, Morocco
This is a nice, 3.1" long, trilobite (Crotalocephalina gibbus) quarried from the Lhandar Formation near Atchana, Morocco. Excellent shell preservation and preparation. There are a few patches of shell restoration on the front of the head and on the top of the first few axial rings, maybe 2-3% in total.
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.