The trilobites from the Ohio shales appear to fall towards the less-colonized end of the spectrum, and this may be attributable to the burrowing habits of Flexicalymene.

In a new study, published in Proceedings of the Royal Society B, Harvard researchers describe unusual trilobite fossils prepared as thin sections showing the 3D soft tissues during enrollment.

It was the Ordovician era that provided the best trilobites. The shores of Lake Champlain yield fragmented Triarthrus pieces, and the first trilobite that I ever bought was a crumbling Flexicalymene.

The official state fossil of Ohio is the trilobite Isotelus, found in the 450-million-year-old Ordovician rocks near Cincinnati. Another common Ohio Ordovician trilobite is Flexicalymene , which ...

Paleontologists Find Trilobite’s Last Meal in 465-Million-Year-Old Fossilized Stomach The "absolutely stuffed" arthropod evinces a scavenged diet of several marine species.