Perisphinctoidea, formerly Perisphinctaceae, is a superfamily of Middle Jurassic (Bajocian) to Lower Cretaceous (Barremian) ammonites, commonly with evolute shells with strong ribbing that typically divides about mid flank before crossing the venter.[1]
Some 16 families have been recognized in the Perisphinctoidea. The following is based on Donovan et al. 1981[2] with modification from the Treatise on Invertebrate Paleontology, Part L (1957)[1]