Class Reptilia Linnaeus, 1758 - reptiles
   Subclass †Euryapsida Colbert, 1945 see Subclass Diapsida Osborn, 1903
     Order †Sauropterygia Owen, 1860 see Superorder Sauropterygia Owen, 1860
       1 Suborder †Nothosauria Baur, 1889
       2 Suborder †Plesiosauria Blainville, 1835 see Order Plesiosauria Blainville, 1835
       3 Suborder †Placodontia Owen, 1859