Millions of Years Ago 252.17 247.2 237.0 201.3 174.1 163.5 145.0 100.5 66.0 Avemetatarsalia Triassic Jurassic Cretaceous Early Middle Late Early Middle Late Early Late Scleromochlus Pterosauria Ornithodira Lagerpetidae Marasuchus Dinosauromorpha Genasauria Silesauridae Neornithsichia Nyasasaurus Dinosauriformes Thyreophora Ornithischia Eocursor ? Heterodontosauridae Pisanosaurus Dinosauria Sauropodomorpha Herrerasauria Saurischia Eodromaeus Theropoda Daemonosaurus Tawa Neotheropoda Millions of Years Ago 252.17 247.2 237.0 201.3 174.1 163.5 145.0 100.5 66.0 Triassic Jurassic Cretaceous Early Middle Late Early Middle Late Early Late Cerapoda Ornithopoda Marginocephalia Eocursor Parksosauridae Laquintasaura Kulindadromeus Othnielosaurus Jeholosauridae Neornithischia Leaellynasaura Hexinlusaurus Agilisaurus Stegosauridae Lesothosaurus Stegosaurinae Stegosauria Dacentrurinae Kentrosaurus Tuojiangosaurus Thyreophoroidea Struthiosaurinae Genasauria Huayangosauridae Eurypoda Gigantspinosaurus Panoplosaurinae Nodosauridae Sauropelta Polacanthinae Scelidosaurus Gargoyleosaurus Ankylosauridae Thyreophora Scutellosaurus Kunbarrasaurus Ankylosauria Hylaeosurus Shamosaurinae Ankylosaurinae Pinacosaurus Tianchiasaurus Ankylosaurini Millions of Years Ago 252.17 247.2 237.0 201.3 174.1 163.5 145.0 100.5 66.0 Triassic Jurassic Cretaceous Euhadrosauria Early Middle Late Early Middle Late Early Late Hadrosaurinae Hadrosauridae Hadrosauromorpha Lambeosaurinae Eotrachodon Tethyshadros Hadrosauriformes Hadrosauria Telmatosaurus Bactrosaurus Protohadros Styracosterna Eolambia Ankylopollexia Probactrosaurus Dryomorpha Iguanodontidae Iguanacolossus Theiophytalia Camptosaurus Iguanodontia Dryosauridae Rhabdodontomorpha Tenontosaurus Ornithopoda Muttaburrasaurus Rhabdodontidae Cerapoda Gondwanan Ornithopod Radiation Hypsilophodon Marginocephalia Thescelosaurinae Thescelosaurus Parksosauridae Elasmaria Parksosaurus Changchunsaurus Orodrominae Millions of Years Ago 252.17 247.2 237.0 201.3 174.1 163.5 145.0 100.5 66.0 Triassic Jurassic Cretaceous Early Middle Late Early Middle Late Early Late Ornithopoda Cerapoda Pachycephalosauria Pachycephalosauridae Marginocephalia Stenopelix Yinlong Chaoyangsauridae Ceratopsia Psittacosauridae Liaoceratops Neoceratopsia Aquilops Archaeoceratops Leptoceratopsidae Graciliceratops Protoceratopsidae Coronosauria Zuniceratops Ceratopsoidea Centrosaurinae Ceratopsidae Chasmosaurinae Millions of Years Ago 252.17 247.2 237.0 201.3 174.1 163.5 145.0 100.5 66.0 Triassic Jurassic Cretaceous Early Middle Late Early Middle Late Early Late Neosauropoda Turiasauria Eusauropoda Jobaria Mamenchisauridae Gravisauria Cetiosauridae Shunosaurus Sauropoda Spinophorosaurus Vulcanodontidae Pulanesaura Anchisauria Antetonitrus + Lessemsaurus Melanorosauridae Massopoda Aardonyx Anchisaurus Yunnanosaurus Plateosauria Massospondylidae Plateosauridae Riojasauridae Plateosauravus Efraasia Thecodontosaurus Sauropodomorpha Pantydraco Saturnaliidae Eoraptor Panphagia Saurischia Theropoda Millions of Years Ago 252.17 247.2 237.0 201.3 174.1 163.5 145.0 100.5 66.0 Triassic Jurassic Cretaceous Early Middle Late Early Middle Late Early Late Eutitanosauria Lithostrotia Saltasauridae Titanosauria Aeolosauridae Malawisaurus Andesauroidea Somphospondyli “chubutisaurs” Titanosauriformes Euhelopodide Sauroposeidon Astrodon Macronaria Brachiosauridae Neosauropoda Camarasauridae Bellusaurus Flagellicaudata Diplodocidae Diplodocinae Apatosaurinae Diplodocoidea Dicraeosauridae Rebbachisauridae Jobaria Millions of Years Ago 252.17 247.2 237.0 201.3 174.1 163.5 145.0 100.5 66.0 Triassic Jurassic Cretaceous Early Middle Late Early Middle Late Early Late Tawa Coelophysoidea Dilophosauridae Neotheropoda Tachiraptor Ceratosauria Berberosaurus Ceratosauridae Abelisauridae Neoceratosauria Abelisauroidea Noasauridae Noasaurinae Elaphrosaurinae ? Averostra Monolophosaurus Megalosauria Chilesaurus Spinosauridae Tetanurae Megalosauroidea Megalosauridae Piatnitzkysauridae Bahariasauridae Metriacanthosauridae Carnosauria Allosauridae ? Orionides Veterupristisaurus Allosauria Carcharodontosauria Carcharodontosauridae Neovenator Avetheropoda venatoridae Neo- Chilantaisaurus Megaraptora ? Coelurosauria Millions of Years Ago 252.17 247.2 237.0 201.3 174.1 163.5 145.0 100.5 66.0 Triassic Jurassic Cretaceous Early Middle Late Early Middle Late Early Late Carnosauria Bicentenaria Avetheropoda Tyrannosauridae Bistahieversor Tyrannosauroidea Appalachiosaurus Dryptosaurus Coelurosauria Xiongguanlong “stokesosaurs” Dilong Proceratosauridae Coeluridae Tyrannoraptora Ornitholestes Compsognathidae sauria Ornithomimo Nqwebasaurus Pelecanimimus Harpymimusoidea Ornithomim- Deinocheiridae Maniraptoriformes - Ornithomimidae Eshanosaurus Therizinosauria Falcarius Therizinosauroidea Beipiaosaurus Therizinosauridae Alvarezsauridae Maniraptora Haplocheirus Alvarezsaurus Alvarezsauria Patagonykus Oviraptorosauria Parvicursorinae Incisivosaurus Caudipteridae Pennaraptora Caenagnathidae oidea gnath- Caena- Scansoriopterygidae Oviraptoridae Eumaniraptora Millions of Years Ago 252.17 247.2 237.0 201.3 174.1 163.5 145.0 100.5 66.0 Triassic Jurassic Cretaceous Early Middle Late Early Middle Late Early Late Oviraptorosauria Scansoriopterygidae Troodontinae Jinfengopteryginae Anchiornis Pennaraptora Unenlagiinae Microraptorinae Dromaeosauridae Saurornitholestinae Eudromaeosauria Deinonychus Atrociraptor Eumaniraptora Velociraptorinae Dromaeosaurinae Archaeopteryx Jeholornis Balaur Avialae Omnivoropterygidae Confuciusornithidae Pygostylia Enantiornithes Archaeorhynchus Ornithothoraces Patagopteryx Euornithes Yanornithiformes Ichthyornis Hesperonithes Carinatae Palaeognathae Ornithurae GalloanseraeNeognathae Aves Neoaves.