Almasauridae Dutuit, 1972 † (basis of record)
Anaethaliontidae † accepted as Anaethalionidae Gaudant, 1968 † (basis of record)
Anchisauripodidae Lull, 1904 † (basis of record)
Astraspidae † accepted as Astraspididae † (basis of record)
Ateleaspidae † accepted as Ateleaspididae Traquair, 1899 † (basis of record)
Bananogmiidae † accepted as Plethodidae Loomis, 1900 † (basis of record)
Batrachopodidae Lull, 1904 (basis of record)
Ctenothrissidae † (basis of record)
Eubrontidae Lull, 1904 † (basis of record)
Gigandipodidae Lull, 1904 † (basis of record)
Haplolepidae † accepted as Haplolepididae Westoll, 1944 † (basis of record)
Jaymoytiidae † accepted as Jamoytiidae White, 1946 † (basis of record)
Phorusrhacidae Ameghino, 1899 † (basis of record)
Tamiobatidae Hay, 1902 † (basis of record)
Thalassemyidae Rütimeyer, 1878 (basis of record)