Gastriocerataceae
 Gastriocerataceae is one of seventeen superfamilies in the suborder Goniatitina ammonoid cephalopods from the Late Paleozoic. Gastrioceratacean shells are variable in form with a broad whorl section and wide umbilicus. Early whorls are commonly evolute. Shells may be smooth or sculptured with transverse striae (fine groovs) and constrictions. The ventral lobe of the suture is double pronged prongs being relatively wide but sides not diverging.