Phylum Chordata Bateson, 1885 - chordates
Subphylum Vertebrata Cuvier, 1812 - vertebrates
Class Reptilia Linnaeus, 1758 - reptiles
Subclass Diapsida Osborn, 1903 - diapsids
see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
Infraclass Archosauromorpha Huene, 1946
see Clade Archosauromorpha Huene 1946 [Benton 1985], nom. cl. inval.
Superorder Archosauria Cope, 1869 - archosaurs
see Clade Archosauria Cope 1869 [Gauthier & Padian 1985], nom. cl. inval.
Order †Ornithischia Seeley, 1887
Suborder †Pachycephalosauria Maryañska & Osmólska, 1974
see Infraorder Pachycephalosauria Maryañska & Osmólska, 1974
Family †Chaoyoungosauridae
1 Genus †Chaoyoungosaurus Chao
2 Genus †Xuanhuasaurus Chao, 1985, nom. nud.