| Ornithischia |
| -Ornithischia |- Galtonia |- Pekinosaurus |- Pisanosaurus ` - + |- Fabrosaurus |?- Gongbusaurus |- Lesothosaurus ` - Genasauria |- Echinodon |- Taveirosaurus |?- Thecospondylus |- Cerapoda | |- Marginocephalia | | |- Stenopelix | | |- Pachycephalosauria | | | |- Wannanosaurus | | | ` - Goyocephalia | | | |- Goyocephale | | | |- Micropachycephalosaurus | | | ` - Homalocephaloidea | | | |- Homalocephale | | | ` - Pachycephalosauridae | | | ` - Pacycephalosaurinae | | | ` - Pachycephalosaurini | | ` - Ceratopsia | | |- Psittacosauria | | | ` - Psittacosaurus | | ` - Neoceratopsia | | |?- Chaoyangsaurus | | |- Archaeoceratops | | |?- Kulceratops | | ` - Coronosauria | | |- Bagaceratops | | |- Breviceratops | | |- Protoceratops | | ` - Ceratopsoidea | | |- Montanoceratops | | ` - Ceratopsomorpha | | |- Zuniceratops | | ` - + - Turanoceratops | | ` - Ceratopsidae | | |- Centrosaurinae | | | |- Centrosaurini | | | ` - Pachyrhinosaurini | | ` - Ceratopsinae | |- Heterodontosauridae | | ` - Heterodontosaurinae | | ` - Heterodontosaurini | ` - Ornithopoda | |- Bugenasaura | |- Thescelosaurus | ` - + - Zephyrosauridae | |- Othnieliidae | | ` - Othnieliinae | ` - Euornithopoda | |- Parksosaurus | |- Hypsilophodontia | | ` - Hypsilophodon | ` - Iguanodontia | |?- "Mandschurosaurus" laosensis | |?- Muttaburrasaurus | |- + - Tenontosaurus | | ` - + | | ` - Rhabdodon | ` - Euiguanodontia | |- Gasparinisaura | ` - Dryomorpha | |?- Anabisetia | |- Dryosauridae | ` - Ankylopollexia | |- Camptosauridae | ` - Styracosterna | ` - Iguanodontoidea | |- Iguanodon | ` - Hadrosauroidea | |- Altirhinus | |- Ouranosaurus | ` - + - Nanyangosaurus | ` - Hadrosauridae ` - Thyreophora |- Scutellosaurus ` - Thyreophoroidea |- Emausaurus ` - Eurypoda |- Scelidosaurus |- Stegosauria | |?- Hesperosaurus | |- Huayangosauridae | ` - Stegosauridae | ` - Stegosaurinae | ` - Stegosaurini ` - Ankylosauria |- Minmi ` - Ankylosauroidea |- Nodosauridae | |- Edmontoniinae | ` - Panoplosaurinae ` - Ankylosauridae |- Polacanthinae | ` - Polacanthini ` - + - Shamosaurinae ` - Ankylosaurinae ` - Syrmosaurini |