Belongs within: Agoniatitina. The Lower to Middle Devonian Agoniatitaceae were an early group of ammonoid cephalopods. They probably started life in shallow waters, becoming more nektonic as they reached maturity (Klug & Korn 2002). Members of the family Pinacitidae possessed a very narrow to closed umbilicus (Klug & Korn 2002); the umbilicus may remain open… Continue reading Agoniatitaceae