Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Teleostomi
       Tetrapoda Goodrich, 1930
         Amniota Haeckel, 1866 - amniotes
           Class Reptilia Linnaeus, 1758 [paraphyletic] - reptiles
             Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Laurin 1991]
               Infraclass Lepidosauromorpha Benton, 1983 see Subclass Lepidosauromorpha Benton, 1983
                 Superorder †Sauropterygia Owen, 1860
                   1 Family †Claudiosauridae Carroll, 1981 [monotypic]
                   2 Order †Nothosauria Baur, 1889 - nothosaurs see Suborder Nothosauria Baur, 1889
                   3 Order †Plesiosauria Blainville, 1835 - plesiosaurs