This Specimen has been sold.
Zlichovaspis & Metacanthina Trilobites - Lghaft, Morocco
This is a natural association of two different trilobites from the Lhandar Formation at Lghaft, Morocco. There is a 2.5" long Zlichovaspis spinifera association with 1.8" long Metacanthina issoumourensis. Both trilobites are outstretched and nicely prepared.
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.