Psilocerataceae

The Psilocerataceae are a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt, 1867, assigned to the order Ammonitida.

The Psilocerataceae are probably derived from the Ussuritidae, which are found in the Phylloceratida, and combine five families, the Psiloceratidae, Echioceratidae, Schlotheimiidae, Arietitidae, and Oxynoticeratidae. The Psiloceratidae, which is the ancestral and type family, provides the basic description for the group.

Families Included

 * Psiloceratidae 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


 * Echioceratidae
 * Schlotheimiidae
 * Arietitdae
 * Oxynoticeratidae