Dinosauria The MRCA of Saurischia and Ornithischia, and its descendants *** Eoraptor The most basal known dinosaur Saurischia Sauropodomorpha Brontosauria Plateosauria Massospondylidae Yunnanosaurinae *** Yunnanosaurus Sauropoda Eusauropoda *** Jobaria Neosauropoda Diplodocimorpha Rebbachisauridae Rebbachisaurinae *** Rebbachisaurus Macronaria Camarasauromorpha Titanosauriformes Brachiosauridae *** Sauroposeidon Titanosauria Eutitanosauria *** Argentinosaurus Theropoda Neotheropoda Ceratosauria Coelophysoidea Coelophysidae Coelophysinae *** Dilophosaurus Neoceratosauria *** Xenotarsosaurus Tetanurae Spinosauria Spinosauridae Spinosaurinae Irritatorini *** Irritator Avetheropoda aka. Neotetanurae Carnosauria Previously used just to mean "large theropods" *** Fukuiraptor Allosauroidea Allosauridae Carcharodontosaurinae Some consider these animals derived abelisaurs *** Giganotosaurus Probably the heaviest known theropod Coelurosauria Previously used just to mean "small theropods" Maniraptoriformes [unnamed] Unnamed clade {Ornithomimosauria+Tyrannosauria} Arctometatarsalia Ornithomimosauria *** Harpymimus Tyrannosauroidea Tyrannosauridae Tyrannosaurinae Tyrannosaurini *** Tyrannosaurus Maniraptora Oviraptorosauria Oviraptoridae *** Oviraptor Therizinosauria Therizinosauroidea Therizinosauridae *** Nanshiungosaurus Paraves Eumaniraptora Deinonychosauria Troodontidae *** Byronosaurus Dromaeosauridae Velociraptorinae *** Velociraptor Avialae Aves Metornithes Alvarezsauria Alvarezsauridae Mononykinae *** Parvicursor Ornithischia Genasauria Thyreophora Thyreophoroidea Eurypoda Stegosauria Stegosauridae *** Kentrosaurus Ankylosauria *** Minmi Cerapoda Marginocephalia Ceratopsia Neoceratopsia *** Udanoceratops Coronosauria Ceratopsoidea Ceratopsomorpha *** Zuniceratops Pachycephalosauria *** Wannanosaurus Ornithopoda *** Qantassaurus Euornithopoda Iguanodontia Euiguanodontia Dryomorpha Ankylopollexia Styracosterna *** Lurdosaurus Iguanodontoidea Hadrosauroidea Hadrosauridae Euhadrosauria Lambeosaurinae Lambeosaurini *** Corythosaurus