Note that Mya is million years ago. For example, "48.6～40.4 Mya" shows a range between 48.6 and 40.4 million years ago. The time range and the epoch are shown in the Geological Time Table.

Phylogenetic Tree of Reptiles (Dinosaurs)

  • Kingdom Animalia
    • Phylum Chordate
      • Subphylum Vertebra
        • Infraphylum Gnathostomata (Jawed vertebrates)
          • Series Amniota ⇐ Class Amphibia (Reptiliomorpha)
            • Class Synapsida (Mammal-like reptiles)
              • Order Pelycosauria (318.1～255 Mya) Mammal-like reptile
                • Suborder Eupelycosauria
                • Suborder Caseasauria
              • Order Therapsida (279.5～183 Mya) Mammal-like reptile
                • Suborder Biarmosuchia (Primitive therapsids)
                • Suborder Dinocephalia (Eutherapsida)
                • Suborder Anomodontia (Neotherapsida)
                • Suborder Gorgonopsia (Theriodont)
                • Suborder Therocephalia (Eutheriodontia)
                • Suborder Cynodontia (Eutheriodontia)
                • Division Mammaliaformes (Mammal-shaped reptile; 228～189.6 Mya) Primitive mammal ⇒ Class Mammalia
            • Class Sauropsida (Non mammal-like reptiles)
              • Subclass Anapsida (No arch near the temples)
                • Order Mesosauria (Small marine reptiles) Marine reptile
                • Order Captorhinida (Early reptiles) Primitive reptile
                • Order Procolophonomorpha (Ancestors of turtles; 272.5～199.6 Mya) Primitive turtle
                • Order Testudines (203.6 Mya～) Turtle
                  • Suborder Proganochelydia
                  • Suborder Cryptodira
                  • Suborder Pleurodira (Side-necked turtles)
              • Subclass Diapsida (Two arches near the temples)
                • Order Araeoscelidia (Small reptiles; 305～272.5 Mya) Primitive reptile
                • Order Avicephala (Small reptiles) Primitive reptile
                • Order Younginiformes (260.5～249.7 Mya) Marine reptile
                • Order Thalattosauria (237～216.5 Mya) Marine reptile
                • Infraclass Ichthyosauria
                  • Order Ichthyosauria (Large marine reptiles; 249.7～65.5 Mya) Marine reptile
                • Infraclass Lepidosauromorpha (Lizards, Snakes, Tuatara)
                  • Order Eolacertilia (Ancestors of snakes and lizards) Primitive reptile
                  • Superorder Sauropterygia (Marine reptiles with flippers)
                    • Order Placodontia (Marine reptiles with ablet teeth; 245～199.6 Mya) Marine reptile
                    • Order Nothosauroidea (251～245 Mya) Marine reptile
                    • Order Plesiosauria (216.5～65.5 Mya) Marine reptile
                      • Suborder Plesiosauroidea (Long-necked plesiosaurs)
                      • Suborder Pliosauroidea (Short-necked plesiosaurs)
                  • Superorder Lepidosauria
                    • Order Sphenodontia (Tuatara; 245 Mya～) Lizard
                    • Order Squamata (Lizards, Snakes; 228 Mya～)
                      • Suborder Squamata
                        • Infraorder Iguania (Iguana, Chamaeleon) Iguana Chameleon
                        • Infraorder Gekkota (Gecko) Gecko
                        • Infraorder Scincomorpha Lizard
                        • Infraorder Diploglossa
                        • Infraorder Varanoidea Monitor lizard
                      • Suborder Serpentes Snake
                        • Infraorder Alethinophida (Vipers, Boas, Cobras)
                        • Infraorder Scolecophida (Blind snakes)
                      • Suborder Amphisbaenia
                • Infraclass Archosauromorpha (Crocodiles, Pterosaurs, Dinosaurs)
                  • Order Prolacertiformes (299～199 Mya) Archosauromorphs
                  • Order Rhynchosauria (245～203.6 Mya) Archosauromorphs
                  • Order Choristodera (Aquatic reptiles; 165～20 Mya) Archosauromorphs
                  • Parvclass Archosauria (Crocodiles, Pterosaurs, Dinosaurs)
                    • Clade Crurotarsi　(Crocodiles and the relatives)
                      • Superorder Crocodylomorpha
                        • Order Crocodyliformes (203.6～65.5 Mya) Primitive crocodile
                          • Suborder Sphenosuchia
                          • Suborder Protosuchia (Early crocodiles)
                          • Suborder Mesosuchia (Aquatic crocodiles)
                            • Infraorder Notosuchia
                            • Infraorder Neosuchia
                          • Suborder Thalattosuchia (Sea Crocodiles)
                        • Order Crocodilia (203.6 Mya～) Crocodile
                        • Order Phytosauria (Large aquatic archosaurs; 228～199.6 Mya) Archosaurs
                        • Order Aetosauria (Medium armoured archosaurs; 228～130 Mya) Archosaurs
                        • Order Rauisuchia (Large predatory archosaurs; 249.7～199.6 Mya) Archosaurs
                    • Clade Ornithodira (Pterosaurs, Dinosaurs)
                      • Order Pterosauria (228～65.5 Mya)
                        • Suborder Rhamphorhynchoidea (Primitive pterosaurs; 228～99.6 Mya) Flying reptile
                        • Suborder Pterodactyloidea (Advanced pterosaurs; 199.6～65.5 Mya) Flying reptile
                      • Superorder Dinosauria
                        • Order Ornithischia (Herbivorous dinosaurs; 228～65.5 Mya)
                          • Suborder Thyreophora (Amored dino; 203.6～65.5 Mya)
                            • Infoorder Stegosauria (175.6～65.5 Mya) Amored dino
                            • Infoorder Ankylosauria (196.5～65.5 Mya) Amored dino
                          • Suborder Cerapoda (228～65.5 Mya)
                            • Infoorder Ornithopod Bird-hipped dino
                              • Family Hadrosauridae Duck-billed dino
                            • Infoorder Ceratopsia (161.2～65.5 Mya) Horned dino
                            • Infoorder Pachycephalosauria (85.8～65.5 Mya) Thick-headed dino
                        • Order Saurischia (Dinosaurs; 245～65.5 Mya)
                          • Suborder Sauropodomorpha (Long-necked　herbivorous dino; 237～65.5 Mya)
                            • Infoorder Prosauropoda (237～65.5 Mya) Long-necked dino
                            • Infoorder Sauropoda (216.5～65.5 Mya) Long-necked dino
                              • Parvorder Neosauropoda Long-necked dino
                          • Suborder Theropoda (Carnivorous bipedal dino; 245～65.5 Mya)
                            • Infoorder Herrerasauria (Small-sized theropods; 216.5～203.6 Mya) Predatory dino
                            • Infoorder Ceratosauria (228～65.5 Mya) Predatory dino
                            • Clade Tetanurae (Dinosarus with stiff tail)
                              • Infoorder Carnosauria (189.6～65.5 Mya) Predatory dino
                              • Infoorder Coelurosauria (199.6～65.5 Mya) Predatory dino
                              • Infoorder Ornithomimosauria (130～65.5 Mya) Ostrich dino
                              • Clade Maniraptora (Dinosarus and Birds) ⇒ Class Aves
                                • Infoorder Oviraptorosauria (125～65.5 Mya) Feathered dino
                                • Infoorder Deinonychosauria (167.7～65.5 Mya) Feathered dino