The first dinosaurs appeared around 225 million years ago (mya) in a time known as the Mesozoic Era. Scientists divide this era into 3 periods: the Triassic, Jurassic and Cretaceous.
Select a section of the timeline below to see dinosaurs that lived then.
| NAME (GENUS) | TAXONOMY | BODY SHAPE |
|---|---|---|
| Abelisaurus | Dinosauria, Saurischia, Theropoda, Neotherapoda, Ceratosauria, Neoceratosauria, Abelisauridae, Abelisaurinae |
|
| Achelousaurus | Dinosauria, Ornithischia, Genasauria, Cerapoda, Marginocephalia, Ceratopsia, Neoceratopsia, Coronosauria, Ceratopsomorpha, Ceratopsidae, Centrosaurinae |
|
| Achillobator | Dinosauria, Saurischia, Theropoda, Neotherapoda, Tetanurae, Avetherapoda, Coelurosauria, Tyrannoraptora, Maniraptoriformes, Maniraptora, Paraves, Eumaniraptora, Dromaeosauridae |
|
| Aegyptosaurus | Dinosauria, Saurischia, Sauropodomorpha, Sauropoda, Eusauropoda, Neosauropoda, Macronaria, Camarasauromorpha, Titanosauriformes, Titanosauria |
|
| Alamosaurus | Dinosauria, Saurischia, Sauropodomorpha, Sauropoda, Eusauropoda, Neosauropoda, Macronaria, Camarasauromorpha, Titanosauriformes, Titanosauria, Lithostrotia |
|
| Albertaceratops | Dinosauria, Ornithischia |
|
| Albertosaurus | Dinosauria, Saurischia, Theropoda, Neotherapoda, Tetanurae, Avetherapoda, Coelurosauria, Tyrannoraptora, Tyrannosauroidea, Tyrannosauridae, Albertosaurinae |
|
| Alectrosaurus | Dinosauria, Saurischia, Theropoda, Neotherapoda, Tetanurae, Avetherapoda, Coelurosauria, Tyrannoraptora, Tyrannosauroidea |
|
| Alioramus | Dinosauria, Saurischia, Theropoda, Neotherapoda, Tetanurae, Avetherapoda, Coelurosauria, Tyrannoraptora, Tyrannosauroidea |
|
| Alvarezsaurus | Dinosauria, Saurischia, Theropoda, Neotherapoda, Tetanurae, Avetherapoda, Coelurosauria, Tyrannoraptora, Maniraptoriformes, Maniraptora, Alvarezsauridae |
|
| Ampelosaurus | Dinosauria, Saurischia, Sauropodomorpha, Sauropoda, Eusauropoda, Neosauropoda, Macronaria, Camarasauromorpha, Titanosauriformes, Titanosauria, Lithostrotia |
|
| Anatotitan | Dinosauria, Ornithischia, Genasauria, Cerapoda, Ornithopoda, Euornithopoda, Iguanadontia, Euiguanadontia, Dryomorpha, Ankylopollexia, Iguanodontoidea, Hadrosauridae, Euhadrosauria, Hadrosaurinae |
|
| Anchiceratops | Dinosauria, Ornithischia, Genasauria, Cerapoda, Marginocephalia, Ceratopsia, Neoceratopsia, Coronosauria, Ceratopsomorpha, Ceratopsidae, Chasmosaurinae |
|
| Ankylosaurus | Dinosauria, Ornithischia, Genasauria, Thyreophora, Ankylosauromorpha, Ankylosauria, Ankylosauridae |
|
| Anserimimus | Dinosauria, Saurischia, Theropoda, Neotherapoda, Tetanurae, Avetherapoda, Coelurosauria, Tyrannoraptora, Maniraptoriformes, Ornithomimosauria, Ornithomimidae |
|
| Antarctopelta | Dinosauria, Ornithischia, Genasauria, Thyreophora, Ankylosauromorpha, Ankylosauria |
|
| Antarctosaurus | Dinosauria, Saurischia, Sauropodomorpha, Sauropoda, Eusauropoda, Neosauropoda, Macronaria, Camarasauromorpha, Titanosauriformes, Titanosauria, Lithostrotia |
|
| Aralosaurus | Dinosauria, Ornithischia, Genasauria, Cerapoda, Ornithopoda, Euornithopoda, Iguanadontia, Euiguanadontia, Dryomorpha, Ankylopollexia, Iguanodontoidea, Hadrosauridae, Euhadrosauria, Hadrosaurinae |
|
| Archaeornithomimus | Dinosauria, Saurischia, Theropoda, Neotherapoda, Tetanurae, Avetherapoda, Coelurosauria, Tyrannoraptora, Maniraptoriformes, Ornithomimosauria, Ornithomimidae |
|
| Argentinosaurus | Dinosauria, Saurischia, Sauropodomorpha, Sauropoda, Eusauropoda, Neosauropoda, Macronaria, Camarasauromorpha, Titanosauriformes, Titanosauria |
|
| Arrhinoceratops | Dinosauria, Ornithischia, Genasauria, Cerapoda, Marginocephalia, Ceratopsia, Neoceratopsia, Coronosauria, Ceratopsomorpha, Ceratopsidae, Chasmosaurinae |
|
| Aucasaurus | Dinosauria, Saurischia, Theropoda, Neotherapoda, Ceratosauria, Neoceratosauria, Abelisauroidea, Abelisauria |
|
| Avaceratops | Dinosauria, Ornithischia, Genasauria, Cerapoda, Marginocephalia, Ceratopsia, Neoceratopsia, Coronosauria, Ceratopsomorpha, Ceratopsidae, Centrosaurinae |
|
| Avimimus | Dinosauria, Saurischia, Theropoda, Neotherapoda, Tetanurae, Avetherapoda, Coelurosauria, Tyrannoraptora, Maniraptoriformes, Maniraptora, Oviraptorosauria, Avimimidae |
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| Bactrosaurus | Dinosauria, Ornithischia, Genasauria, Cerapoda, Ornithopoda, Euornithopoda, Iguanadontia, Euiguanadontia, Dryomorpha, Ankylopollexia, Iguanodontoidea, Hadrosauridae |
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