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 see Infraphylum Vertebrata Lamarck, 1801
             Class Reptilia Linnaeus, 1758 - reptiles
               Subclass †Euryapsida Colbert, 1945 see Subclass Diapsida Osborn, 1903
                 Order †Sauropterygia Owen, 1860 see Superorder Sauropterygia Owen, 1860
                   Suborder †Plesiosauria Blainville, 1835 see Order Plesiosauria Blainville, 1835
                     Family †Elasmosauridae Cope, 1869
                       1 Genus †Elasmosaurus Cope, 1868