This Specimen has been sold.
Sweet Crotalocephalina & Reedops Trilobite Association
This is a natural association of a Crotalocephalina gibbus and a Reedops from Laatchana, Morocco. The specimens has been painstakingly prepared to remove the surrounding limestone, leaving the trilobite fossils perched in an aesthetic display. The Crotalocephalina measures 3.1" long and has no restoration, the Reedops is 1.5" long and only has a tiny bit of restoration along a repaired crack through the head.
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.