1.35" Spiny Leonaspis Trilobite - Large Specimen
Here is a large, spiny Leonaspis trilobite from Morocco. It's 1.35" in length and the preparation is quite nice with both the genal spines prepared free of the surrounding rock.
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.