Perisphinctoidea
Sign in to savePerisphinctoidea, 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.
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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.
==Classification== Some 16 families have been recognized in the Perisphinctoidea. The following is based on Donovan et al. 1981 with modification from the Treatise on Invertebrate Paleontology, Part L (1957) Perisphinctidae: Middle and Upper Jurassic root stock, derived from the Stephanoceratidae