See text Stephanoceratoidea, formerly Stephanocerataceae, is a superfamily of middle- upper Jurassic ammonoid cephalopods within the order Ammonitida containing diverse forms, generally with sharp ribbing and complex suture lines.

Aptychi are believed to be mostly granular (Granulaptycus) or concentrically ribbed on the surface (Praestriaptychus) (Arkell et al. 1957) The shells of the Stephanoceratoidea, which determine the different included families, are highly variable in form.

(Arkell et al. 1957) Stephanoceratoidea contains five families according to Donovan et al. (1981), a reduction from the 11 listed in the Treatise on Invertebrate Paleontology, 1957 Part L. They are the: The Pachyceratidae and Tulitidae included in the Stephanoceratoidea in the Treatise (1957) are reassigned to the Perisphinctoidea.

The Macrocephalotidae and Mayaitidae of the Treatise are reduced to subfamilies within the Sphaeroceratidae, Macrocephalitinae and Mayaitinae, but still in the Stephanoceratoidea.

This differs from the older phylogeny of the Treatise Part L the Stephanoceratoidea are thought to be derived from the Hammatoceratidae (Hildoceratoidea) through the ancestral family, the Otoitidae which gave rise in the early Middle Jurassic to the Stephanoceratidae and Sphaeroceratidae, forming two main lineages.