7.8" Long, Prone Isotelus Brachycephalus Trilobite - Ohio

This is a large, 7.8" long, prone Isotelus brachycephalus trilobite collected from the Waynesville Formation (Blanchester Series) of Adams County, Ohio. It's nicely centered on large slab of stabilized shale that measures 15.7 x 13.5".

As is almost always the case with these large Isotelus, the shell was very fractured so it required substantial amounts of repair to put it back into place, and restoration or any missing bits of shell. The right genal spine has mostly been restored and left with free-standing presentation.

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.
Isotelus brachycephalus
Adams County, Ohio
Waynesville Formation, Blanchester Series
Trilobite: 7.8" long, Rock: 15.7 x 13.5"
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