Phylum [Vertebrata] (Lamarck, 1801) Class Reptilia Linnaeus, 1758 - reptiles Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020] Order †Ichthyosauria Blainville, 1835 Family †Shastasauridae Merriam, 1902 Genus †Cymbospondylus Leidy, 1868