Phylum [Vertebrata] (Lamarck, 1801) Class Reptilia Linnaeus, 1758 - reptiles Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020] Order †Thalattosauria (Merriam, 1905) Family †Thalattosauridae Merriam, 1904 Genus †Thalattosaurus Merriam, 1904