Dinosauria Owen 1841 [Padian & May 1993], nom. cl. inval. see Clade Dinosauria Owen 1842 [Langer, Novas, Bittencourt, Ezcurra & Gauthier 2020]
Count: -
   †Ornithischia Seeley 1887 [Padian & May 1993] see Order Ornithischia Seeley, 1887
  Count: -
     †Genasauria Sereno 1986
    Count: -
       1 †Thyreophora Nopcsa 1915 see Suborder Thyreophora Nopcsa, 1915
      Count: [†*] †10g
       2 †Neornithischia Cooper 1985
      Count: -