Claim: Cyrtoceras lived from the late Cambrian to the middle Devonian, a geologic period and system of the Paleozoic, and were part of the Animalia kingdom in the Cephalopoda class.
Evidence: Cyrtoceras is an extinct genus of oncoceridan nautiloids that lived from the middle Ordovician to the middle Devonian, in Africa, Europe, North America and South America.