Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
   Gnathostomata
     Teleostomi Bonaparte, 1836
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988], nom. cl. inval. see Clade Tetrapoda Hatschek & Cori 1896 [Laurin 2020]
         Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988], nom. cl. inval. - amniotes see Clade Amniota Haeckel 1866 [Laurin & Reisz 2020]
           Class Reptilia Linnaeus, 1758 [paraphyletic] - reptiles
             Order †Ichthyopterygia Blainville, 1835 [coordinate rank]
               Family †Shastasauridae Merriam, 1902
                 1 Genus †Cymbospondylus Leidy, 1868
                 2 Genus †Delphinosaurus Merriam, 1905, nom. illeg. see Genus Californosaurus Kuhn, 1934
                 3 Genus †Himalayosaurus Carroll, 1988, orth. inval. see Genus Himalayasaurus Dong, 1972
                 4 Genus †Merriamia Boulenger, 1904
                 5 ?Genus †Pessosaurus Wiman, 1910, nom. dub.
                 6 Genus †Shastasaurus Merriam, 1895
                 7 Genus †Shonisaurus Camp, 1976
                 8 Genus †Toretocnemus Merriam, 1903