vertebrates Cuvier, 1812 - vertebrates
   Cohort Amniota Haeckel, 1866 see Clade Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988]
     Class "Reptilia" Linnaeus, 1758 - reptiles
       Subclass Sauropsida Huxley, 1864
         Superorder †Euryapsida Colbert, 1945
           Order †Sauropterygia Owen, 1860 see Superorder Sauropterygia Owen, 1860
             Suborder †Plesiosauria Blainville, 1835 see Order Plesiosauria Blainville, 1835
               1 Superfamily †Plesiosauroidea Nopcsa, 1928 see Suborder Plesiosauroidea Welles, 1943
               2 Superfamily †Pliosauroidea Welles, 1943 see Suborder Pliosauroidea Welles, 1943