This Specimen has been sold.
2.35" Hollardops Trilobite - Multi-Toned Shell Color
This is a 2.35" long example of the trilobite Hollardops mesocristata from Ofaten, Morocco. Very nice preparation, with nice shell detail including clear eye facets in both eyes. It has a natural multi-tone shell coloration frequently seen on trilobites from the site. This is due to part fo the trilobite being closer to a seam in the rock which hot liquids flowed through. This leached certain minerals from the shell changing it's color.
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 currently described species, filling nearly every evolutionary niche. Due in large part to a hard exoskeleton (shell), they left an excellent fossil record.