The Aipoceratoidea are a superfamily within the order Nautilida characterized by rapidly expanding, smooth to ribbed, cyrtoconic to coiled shells with rounded or sometimes dorsally flattened or impressed whorls, nearly straight sutures, and a ventral and marginal siphuncle. Septal necks are orthochoanitic ventrally and orthochoanitic or cyrtochoanitic dorsally.Kummel, B. 1964. Nautiloidea - Natilida; Treatise on Inertebrate Paleontology part K; Geological Society of America and University of Kansas Press. :see als
Paleobiology Database
The Aipoceratoidea are the Solenochilida according to FlowerFlower & Kummel 1950. A Classification of the Nautiloidea; Journal of Paleontology, V.24, n.5, pp604–616, Sept 1950. and are the Solenocheilaceae which Shimansky included in his Rutoceratina minus the Litogyroceratidae which the Treatise includes in the

Rutoceratidae Rutoceratidae is a family of prototypical nautilids, derived probably from either Brevicoceratidae or Acleistoceratidae of the order Oncocerida early in the Devonian. Rutoceratidae comprise a family within the oncocerid superfamily Tainoceratac ...

( Tainocerataceae) The Aipoceratoidea include three families and at least nine genera. The families are the Aipoceratidae Hyatt 1883, Solenochilidae Hyatt 1893, and Scyphoceratidae Ruzhentsev & Shimansky 1954. The Aipoceratidae are represented by the loosely coiled, compressed and gyroconic ''Aipoceras'' from the Lower Carboniferous (Miss) of Europe and North America; the Solenochilidae by the tightly coiled cosmopolitan ''Solenochilis'' from the Upper Carboniferous (Penn)- Lower Permian, with spines projecting straight out laterally from the umbilical region; Scyphoceratidae by ''Scyphoceras'' from the Lower Permian of the Urals which has a ribbed shell and a relatively small and sharply curved phragmocone. The derivation of the Aipoceratoidea is somewhat tenuous. Kummel (1964, K385 fig. 280) shows a tentative connection to the Rutoceratidae in the Devonian. Flower also shows a tentative connection but from the equivalent Solenochilida to the Barrndeocerida. Shimansky, though, shows a direct connection from the Solenocheilaceae to the Rutoceratidae.

References

Prehistoric nautiloids Prehistoric animal superfamilies Mississippian first appearances Cisuralian extinctions {{paleo-nautiloid-stub