Leptoceratopsidae Ceratopsomorpha Ceratopsidae (Triceratops + Styracosaurus) Centrosaurinae Chasmosaurinae Baron/Norman/Barrett classification In 2017 Matthew G. Baron and his colleagues published a new analysis proposing to put Theropoda (except Herrerasauridae) and Ornithischia within a group called Ornithoscelida (a name originally coined by Thomas Henry Huxley in 1870), redefining Saurischia to cover Sauropodomorpha and Herrerasauridae. Amongst other things this would require hypercarnivory to have evolved independently for Theropoda and Herrerasauridae. This scheme is currently debated among palaeontologists, with recent studies finding little difference between the traditional and newly proposed models. Dinosauria Ornithoscelida Ornithischia Theropoda Saurischia Sauropodomorpha Herrerasauridae Cau 2018 In his paper about the stepwise evolution of the avian bauplan, Cau (2018) found in the parsimony analysis a polytomy between herrerasaur-grade taxa, Sauropodomorpha and the controversial Ornithoscelida. The Bayesian analysis, however, found weak support for the sister grouping of Dinosauria and Herrerasauria, but strong support for the dichotomy between Sauropodomorpha and Ornithoscelida, as shown below: See also List of dinosaur genera Footnotes References . Classification Systems of animal taxonomy