Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             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