Agoniatites is a genus of primitive ammonoids belonging to the order Agoniatitida family Agoniatitidae. Species of this genus were fast-moving nektonic carnivore shelled ammonoids. They lived in the Eifelian and Givetian ages of the middle Devonian period, which occurred 385.3-397.5 million years ago. Vanuxemi agoniatites is a rare species in this group which is the only ammonoid found in the Hamilton Group (Mahantango Formation) in Pennsylvania and New York. Fossil distribution Devonian of Algeria, Canada (Northwest Territories), the Czech Republic, Morocco, Russia, United States (Alaska, Nevada, New York, Pennsylvania) Species Agoniatites annulatus Agoniatites bicanaliculatus Agoniatites costulatus Agoniatites kayseri Wedekind Agoniatites nodiferus Hall Agoniatites obliquus Whidborne Agoniatites occultus Agoniatites vanuxemi Gallery References Zipcodezoo Biolib The Paleobiology Database Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopodes Wikimedia Commons Agoniatitida Middle Devonian ammonites Devonian ammonites of North America Paleozoic life of the Northwest Territories