1.95 Large Declivolithus Trilobite (Pos/Neg) - Mecissi, Morocco

This is a large, 1.95" wide specimen of the Trinucleid trilobite Declivolithus from Morocco. It has a natural, orange preservation due to the oxidiation of iron pyrite which had replaced the fossil. It includes both the positive and negative split of the fossil.

This trilobite has really dramatic cephalic pits along its "head shield". It's unknown the exact purpose of these pits, they could have had sensory purposes or aided in filter feeding.

An Upper Ordovician (Katian) Trilobite Fauna From the Lower Ktaoua Formation, Morocco

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: over 25,000 species have been described, filling nearly every evolutionary niche. Due in large part to their hard exoskeletons (shells), they left an excellent fossil record.
Declivolithus (Nankinolithus) titan
Mecissi, Morocco
Lower Ktaoua Formation
1.95" wide on 7.4 x 3" shale
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