See text Psiloceratoidea is a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt in 1867, assigned to the order Ammonitida.

Last of them, family Cymbitidae and genera Hypoxynoticeras and Radstockiceras survived into Early Pliensbachian.

[1] Psiloceratoidea is probably derived from the family Ussuritidae, which were Triassic members of Phylloceratoidea.

Similar to their ancestors, Psiloceratidae kept smooth, rounded venter for whole of their life.

Rest of the families had angular venter, or keel for at least part of their ontogeny.