The largest Trilobite on display at the Smithsonian Natural History museum is from Ohio! Photo by Mike Rupert on Flickr (used by permission)
Isotelus (Trilobite)
Ohio designated the Isotelus trilobite as the official state fossil in 1985. Isotelus is an extinct arthropod that lived in Ohio about 440 million years ago. It is the largest known trilobite.
