Inflated, Enrolled Isotelus Trilobite - Ohio

This is a very 3D, enrolled Isotelus maximus from the famous trilobite beds at Mt. Orab Ohio. It it was outstretched it would be around 1.8" long. It has beautiful shell preservation unlike many specimens who's shell flakes badly during collection and is restored. The long left genal spine is present but the right genal spine is missing.

Isotelus maximus is the the official state fossil of Ohio.

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.
Isotelus maximus
Mt. Orab, Ohio
Arnheim Formation
1.1" wide, about 1.8" long
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