Goniatite

Goniatids, informally goniatites, are ammonoid cephalopods that form the order Goniatitida, derived from the more basal Agoniatitida during the Middle Devonian some 390 million years ago (around Eifelian stage). Goniatites (goniatitids) survived the Late Devonian extinction to flourish during the Carboniferous and Permian only to become extinct at the end of the Permian some 139 million years later.