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Paleontology and Geology Glossary: TiPaleontology and Geology Glossary: TeDinosaur NewsClassification of DinosaursArchosaurs - Paleontology and Geology GlossaryToday's featured page: School-Related Books to Print



ZoomDinosaurs.com
What are Taxonomy and Cladistics How Are Dinosaurs Classified? Dinosaur Genera Not Dinosaurs, but Old and Interesting
Major Dinosaur Families Saurischian Dinosaurs
"Lizard-Hipped"
Ornithischian Dinosaurs
"Bird-Hipped"
Dinosaur Cladogram

A cladogram of reptilia

Reptilia cladogram


Cladogram: Ornithodira (Dinosaurs, Pterosaurs, Birds, etc.)

  • Ornithodira
    1. Lagosuchus
    2. Pterosauria
    3. Dinosauria
      1. Saurischia
        1. Sauropodomorpha
          1. Prosauropoda(?)
            1. Thecodontosaurus
              1. Anchisaurus
                1. Massospondylus
                2. Yunnanosaurus
                      1. Plateosaurus
                      2. Lufengosaurus
                    1. Coloradisaurus
                  1. Sellosaurus
                    1. Blikanasaurus
                      1. Melanorosaurus
                        1. Riojasaurus
                        2. Camelotia
          2. Sauropoda
            1. Vulcanodon
              1. Barapasaurus
                1. Shunosaurus
                  1. Patagosaurus
                    1. Datousaurus
                      1. Omeisaurus
                        1. Haplocanthosaurus
                        2. Camarasaurs and Titanosaurs
                          1. Camarasaurs
                            1. Brachiosauridae
                              1. Brachiosaurus
                              2. Ultrasauros
                            2. Camarasauridae
                              1. Euhelopus
                                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
            1. Herrerasaurus
              1. Ceratosauria
                1. Coelophysoidea
                  1. Dilophosaurus
                    1. Coelophysis
                    2. Syntarsus
                2. Neoceratosauria
                  1. Ceratosaurus
                    1. Elaphrosaurus
                    2. Abelisauridae
              2. Tetanurae (back half of tail stiffened)
                1. Torvosaurus
                2. Avetheropoda (wrist and hand modified for grabbing)
                  1. Megalosaurus
                    1. Allosauridae
                      1. Allosaurus
                      2. Acrocanthosaurus
                    2. Coelurosauria
                      1. Compsognathus
                      2. Maniraptora
                        1. Ornitholestes
                            1. Oviraptoridae
                              1. Oviraptor
                              2. Conchoraptor
                              3. Ingenia
                            2. Arctometatarsalia
                              1. Elmisauridae
                                1. Avimimus
                                  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
                          1. 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
                                  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. Chasmosaurus
                            2. Pentaceratops
                              1. Anchiceratops
                              2. Arrhinoceratops
                              1. Torosaurus
                                1. Diceratops
                                2. Triceratops
              2. Pachycephalosauria (thick skull roof, flat-headed or domed)
                1. Wannanosaurus
                2. Goyocephalia
                  1. Goyocephale
                    1. Homalocephale
                    2. Pachycephalosauridae (dome-headed)
                      1. Yaverlandia
                        1. Majungatholus
                          1. Ornatotholus
                            1. Stegoceras
                              1. Tylocephale
                                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
                      1. Yandusaurus
                      2. Othnielia
                        1. Orodromeus
                        2. Zephyrosaurus
                        1. Hypsilophodon
                        2. Parksosaurus
                2. Iguanodontia
                  1. Tenontosaurus
                    1. Dryosaurus
                      1. Camptosaurus
                        1. Iguanodon
                        2. Ouranosaurus (lumps on forehead)
                        3. Hadrosauridae (head crests)
                          1. Telmatosaurus
                          2. Euhadrosauria
                            1. Hadrosaurinae
                                  1. Gryoposaurus
                                  2. Aralosaurus
                                  1. Brachylophosaurus
                                  2. Maiasaura
                                    1. Saurolophus
                                    2. Prosaurolophus
                                  1. Lophorhothon
                                  1. Anatotitan
                                  2. Shantungosaurus
                                  3. Edmontosaurus
                            2. Lambeosaurinae
                              1. Parasaurolophus
                                1. Lambeosaurus
                                  1. Corythosaurus
                                  2. Hypacrosaurus
          2. Thyreophora (dinosaurs with dermal armor)
            1. Scutellosaurus
              1. Emausaurus
                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
                        1. Kentrosaurus
                        2. (plates along the back)
                          1. Chungkingosaurus
                          2. Chialingosaurus
                            1. Tuojiangosaurus
                            2. Paranthodon
                            3. Lexovisaurus
                            4. Stegosaurus
                  2. Ankylosauria (fused armor)
                    1. Nodosauridae
                      1. Hylaeosaurus
                        1. Acanthopholis
                        2. Struthiosaurus
                          1. Sauropelta
                            1. Silvisaurus
                              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

    by Mitchell Steven Spector



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