2.35" Colorful, Harpides Trilobite - Draa Valley, Morocco
This is a colorful and I believe currently undescribed species of Harpides trilobite from the Lower Fezouata Formation of Morocco. This is a large, detailed example with a brilliant red coloration resulting from the oxidization of iron pyrite.
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.