Phylum [Vertebrata] (Lamarck, 1801) Class Reptilia Linnaeus, 1758 - reptiles Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020] Order †Eosuchia Broom, 1914 see Clade Eosuchia Broom 1914 [Laurin 1991] Family †Tangasauridae Haughton, 1924 Genus †Thadeosaurus Carroll, 1981