Class Reptilia Linnaeus, 1758 - reptiles
   Subclass Anapsida Osborn, 1903 - anapsids
     Order †Cotylosauria Cope, 1880
       1 Suborder †Captorhinomorpha Watson, 1917
       2 Suborder †Diadectomorpha Watson, 1917 see Order Diadectomorpha Watson, 1917
       3 Suborder †Procolophonia Seeley, 1888 see Clade Procolophonia Seeley 1888 [Laurin & Reisz 1995]
       4 Suborder †Promillerosauria