1. Lagosuchus
2. Pterosauria
3. Dinosauria
   1. Saurischia
      1. Sauropodomorpha
         1. Prosauropoda(?)
            1. Thecodontosaurus
            2. 1. Anchisaurus
               2. 1. Massospondylus
                  2. Yunnanosaurus
                  3. 1. 1. 1. Plateosaurus
                           2. Lufengosaurus
                        2. Coloradisaurus
                     2. Sellosaurus
                     3. 1. Blikanasaurus
                        2. 1. Melanorosaurus
                           2. 1. Riojasaurus
                              2. Camelotia
         2. Sauropoda
            1. Vulcanodon
            2. 1. Barapasaurus
               2. 1. Shunosaurus
                  2. 1. Patagosaurus
                     2. 1. Datousaurus
                        2. 1. Omeisaurus
                           2. 1. Haplocanthosaurus
                              2. Camarasaurs and Titanosaurs
                                 1. Camarasaurs
                                    1. Brachiosauridae
                                       1. Brachiosaurus
                                       2. Ultrasauros
                                    2. Camarasauridae
                                       1. Euhelopus
                                       2. 1. Opisthocoelicaudia
                                          2. Camarasaurus
                                 2. Titanosaurs
                                    1. Diplodocidae
                                       1. Diplodocus
                                       2. Apatosaurus
                                       3. Barosaurus
                                       4. Dicraeosaurus
                                       5. Nemegtosaurus
                                       6. Quaesitosaurus
                                       7. Mamenchisaurus
                                    2. Titanosauridae
                                       1. Titanosaurus
                                       2. Saltasaurus
                                       3. Alamosaurus
      2. Segnosauria?
         1. Segnosaurus
         2. Erlikosaurus
         3. Enigmosaurus
         4. Nanshiungosaurus
      3. Theropoda
         1. Eoraptor
         2. 1. Herrerasaurus
            2. 1. Ceratosauria
                  1. Coelophysoidea
                     1. Dilophosaurus
                     2. 1. Coelophysis
                        2. Syntarsus
                  2. Neoceratosauria
                     1. Ceratosaurus
                     2. 1. Elaphrosaurus
                        2. Abelisauridae
               2. Tetanurae (back half of tail stiffened)
                  1. Torvosaurus
                  2. Avetheropoda (wrist and hand modified for grabbing)
                     1. Megalosaurus
                     2. 1. Allosauridae
                           1. Allosaurus
                           2. Acrocanthosaurus
                        2. Coelurosauria
                           1. Compsognathus
                           2. Maniraptora
                              1. Ornitholestes
                              2. 1. 1. Oviraptoridae
                                       1. Oviraptor
                                       2. Conchoraptor
                                       3. Ingenia
                                    2. Arctometatarsalia
                                       1. Elmisauridae
                                       2. 1. Avimimus
                                          2. 1. Tyrannosauridae
                                                1. Aublysodon
                                                2. Albertosaurus
                                                3. Tyrannosaurus
                                                4. Alectrosaurus
                                                5. Daspletosaurus
                                                6. Alioramus
                                                7. Nanotyrannus
                                                8. Tarbosaurus
                                             2. Bullatosauria
                                                1. Troodontidae (sickle-clawed)
                                                   1. Troodon
                                                   2. Saurornithoides
                                                   3. Borogovia
                                                   4. Tochisaurus
                                                2. Ornithomimosauria (light skull, no upper teeth, few if any lower teeth, flat claws on feet)
                                                   1. Harpymimus
                                                   2. Garudimimus
                                                   3. Ornithomimus
                                                   4. Struthiomimus
                                                   5. Dromiceiomimus
                                                   6. Archaeornithomimus
                                                   7. Gallimimus
                                                   8. Anserimimus
                                 2. Dromaeosauria (pubis rotated downward or down-and-backward)
                                    1. Dromaeosauridae (small size; large sickle-shaped claw on foot)
                                       1. Adasaurus
                                       2. Deinonychus
                                       3. Dromaeosaurus
                                       4. Hulsanpes
                                       5. Saurornitholestes
                                       6. Velociraptor
                                    2. Aves (birds -- dinosaurs with feathers)
                                       1. Archaeopteryx
                                       2. (pygostyle instead of tail; fully-folding wing)
                                          1. Sinornis
                                          2. 1. Hesperornithiformes and Ichthyornithiformes
                                             2. Modern birds (no teeth)
   2. Ornithischia
      1. Lesothosaurus
      2. Genasauria
         1. Cerapoda
            1. Marginocephalia (dinosaurs with skull adornments)
               1. Ceratopsia (sharp beak due to rostral bone at tip of snout; frill at back of skull)
                  1. Psittacosauridae
                     1. Psittacosaurus
                  2. Neoceratopsia
                     1. Leptoceratops
                     2. (larger frill; nasal horn)
                        1. Protoceratops
                        2. (prominent nasal horn)
                           1. Monoceratops
                           2. Ceratopsidae
                              1. Centrosaurinae
                                 1. Avaceratops and Brachyceratops
                                 2. (hooks on back of frill)
                                    1. Centrosaurus
                                    2. (spikes at frill margin)
                                       1. Styracosaurus
                                       2. Pachyrhinosaurus
                              2. Chasmosaurinae
                                 1. 1. Chasmosaurus
                                    2. Pentaceratops
                                 2. 1. 1. Anchiceratops
                                       2. Arrhinoceratops
                                    2. 1. Torosaurus
                                       2. 1. Diceratops
                                          2. Triceratops
               2. Pachycephalosauria (thick skull roof, flat-headed or domed)
                  1. Wannanosaurus
                  2. Goyocephalia
                     1. Goyocephale
                     2. 1. Homalocephale
                        2. Pachycephalosauridae (dome-headed)
                           1. Yaverlandia
                           2. 1. Majungatholus
                              2. 1. Ornatotholus
                                 2. 1. Stegoceras
                                    2. 1. Tylocephale
                                       2. 1. Prenocephale
                                          2. Pachycephalosaurus
            2. Ornithopoda
               1. Heterodontosauridae (tusk-like tooth in upper and lower jaw)
                  1. Heterodontosaurus
                  2. Lanasaurus
                  3. Lycorhinus
                  4. Abrictosaurus
               2. Euornithopoda
                  1. Hypsilophodontidae
                     1. Thescelosaurus
                     2. 1. 1. Yandusaurus
                           2. Othnielia
                        2. 1. 1. Orodromeus
                              2. Zephyrosaurus
                           2. 1. Hypsilophodon
                              2. Parksosaurus
                  2. Iguanodontia
                     1. Tenontosaurus
                     2. 1. Dryosaurus
                        2. 1. Camptosaurus
                           2. 1. Iguanodon
                              2. Ouranosaurus (lumps on forehead)
                              3. Hadrosauridae (head crests)
                                 1. Telmatosaurus
                                 2. Euhadrosauria
                                    1. Hadrosaurinae
                                       1. 1. 1. Gryoposaurus
                                             2. Aralosaurus
                                          2. 1. Brachylophosaurus
                                             2. Maiasaura
                                       2. 1. 1. 1. Saurolophus
                                                2. Prosaurolophus
                                             2. Lophorhothon
                                          2. 1. Anatotitan
                                             2. Shantungosaurus
                                             3. Edmontosaurus
                                    2. Lambeosaurinae
                                       1. Parasaurolophus
                                       2. 1. Lambeosaurus
                                          2. 1. Corythosaurus
                                             2. Hypacrosaurus
         2. Thyreophora (dinosaurs with dermal armor)
            1. Scutellosaurus
            2. 1. Emausaurus
               2. 1. Scelidosaurus
                  2. Eurypoda
                     1. Stegosauria (spines or plates along the back; long pairs of spines at the end of the tail)
                        1. Huayangosaurus
                        2. Stegosauridae
                           1. Dacentrurus
                           2. 1. Kentrosaurus
                              2. (plates along the back)
                                 1. Chungkingosaurus
                                 2. Chialingosaurus
                                 3. 1. Tuojiangosaurus
                                    2. Paranthodon
                                    3. Lexovisaurus
                                    4. Stegosaurus
                     2. Ankylosauria (fused armor)
                        1. Nodosauridae
                           1. Hylaeosaurus
                           2. 1. Acanthopholis
                              2. Struthiosaurus
                              3. 1. Sauropelta
                                 2. 1. Silvisaurus
                                    2. 1. Panoplosaurus
                                       2. Edmontonia
                        2. Ankylosauridae (bony tail club; large horns at back of skull)
                           1. Shamosaurus
                           2. (horns larger; eyes further back)
                              1. (large plates covering skull roof; horns narrow; short beak)
                                 1. Tarchia
                                 2. Saichania
                                 3. Pinacosaurus
                              2. (small plates covering skull roof; horns broad-based)
                                 1. Talarurus
                                 2. Euoplocephalus
                                 3. Ankylosaurus

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