Psiloceratidae is an extinct family of cephalopods belonging to the ammonite subclass. The Psiloceratidae are evolute, smooth or with blunt primary ribbing. The venter is rounded and generally smooth, in some feebly keeled. Sutures are simple with phylloid saddle endings in some. The aptychus is single, found in sutu in Psiloceras ==Genera== Fossi...