5.3" Colorful Lower Cambrian Trilobite (Longianda) - Issafen, Morocco
This is a spectacular, 5.3" long example of Longianda termieri (Neltner & Poctey, 1950) from the Issafen Formation of Morocco. It has been beautifully prepared in high relief against the surrounding shale and the natural, rust colored highlights around the edges adds to the aesthetics of the piece. Check out all of the little bumps present all over it, a detail often lost on these trilobites.
In the past few years, deposits near Issafen, Morocco have begun yielding a new assemblage of Early Cambrian trilobites. This fauna is very diverse and consists mainly of ellipsocephalids, chengkouiids, gigantopygids, holmiids, neltneriids, saukiandids, and the latest fallotaspids. The shale when freshly split is a greenish to slightly yellow color but weathers to a light grey.
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.