Class Reptilia Linnaeus, 1758 - reptiles
   Subclass †Euryapsida Colbert, 1945 see Subclass Diapsida Osborn, 1903
     Order †Sauropterygia Owen, 1860 see Superorder Sauropterygia Owen, 1860
       Suborder †Nothosauria Baur, 1889
         1 Family †Nothosauridae Baur, 1889
         2 Family †Simosauridae (Nopcsa, 1928)
         3 Family †Pachypleurosauridae Nopcsa, 1928