Order †Thecodontia Owen, 1859 see Division Archosauria Cope, 1869
   1 Suborder †Proterosuchia Broom, 1906 see Order Proterosuchia Broom, 1906
   2 Suborder †Rauisuchia Bonaparte, 1982 - rauisuchians see [unranked] Rauisuchia Bonaparte, 1982
   3 Suborder †Phytosauria Jaeger, 1828 see Order Phytosauria Jaeger, 1828
   4 Suborder †Aetosauria Nicholson & Lydekker, 1889 see Order Aetosauria Nicholson & Lydekker, 1889
   5 Suborder †Ornithosuchia (Huene, 1908)
   6 Suborder ?