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Temporal range: (Possible Middle Triassic record)
Dinosauria montage 2.jpg
A collection of fossil dinosaur skeletons. Clockwise from top left: Microraptor gui (a winged theropod), Apatosaurus louisae (a giant sauropod), Edmontosaurus regalis (a duck-billed ornithopod), Triceratops horridus (a horned ceratopsian), Stegosaurus stenops (a plated stegosaur), Pinacosaurus grangeri (an armored ankylosaur)
Scientific classification e
Owen, 1842
Major groups

Dinosaurs are a group of Archosaur reptiles of the clade Dinosauria. Dinosaurs are related to birds and crocodiles. They were the most powerful land animals of the Mesozoic era. Over 500 different genera of dinosaurs are known.Fossils of dinosaurs have been found on every continent.

Dinosaurs began in the Upper Triassic, about 230 million years ago (mya). The earliest date of a dinosaur fossil is that of Eoraptor and Herrerasaurus from Argentina, and Saturnalia from Brazil, 237 to 228 mya.

By the early Jurassic they were the top land vertebrates, and dominated most environments on land. They continued until the K/T extinction event 66 million years ago.

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