†unranked clade Diadectomorpha Watson 1917
Alternative spelling: Diadectimorpha
Invalid subtaxa: Limnoscelops Lewis and Vaughn 1965 [nomen dubium], Limnoscelops longifemur Lewis and Vaughn 1965 [nomen dubium]
Parent taxon: Cotylosauria according to M. Laurin and R. R. Reisz 1995
Sister taxa: Amniota, Captorhinomorpha, Chamasaurus, Diadectosauria
Subtaxa: Diadectidae, Limnoscelidae, Tseajaiidae