†superfamily Leiostegiacea Bradley 1925 (trilobite)
Parent taxon: Ptychopariina according to H. J. Harrington and A. F. Leanza 1957
Sister taxa: Conocoryphacea, Guizhoucephalina, Huaiaspis, Liostracinoidea, Luaspididae, Paraantagmus, Ptychopariacea, Ptychoparioidea, Yuknessaspis
Subtaxa: none
Ecology: fast-moving low-level epifaunal deposit feeder
Distribution: there are no occurrences of Leiostegiacea in the database