Dinosaurs can therefore be divided into avian dinosaurs-birds-and the extinct non-avian dinosaurs, which are all dinosaurs other than birds.ĭinosaurs are varied from taxonomic, morphological and ecological standpoints. The fossil record shows that birds are feathered dinosaurs, having evolved from earlier theropods during the Late Jurassic epoch, and are the only dinosaur lineage known to have survived the Cretaceous–Paleogene extinction event approximately 66 mya. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201.3 mya and their dominance continued throughout the Jurassic and Cretaceous periods. They first appeared during the Triassic period, between 245 and 233.23 million years ago (mya), although the exact origin and timing of the evolution of dinosaurs is a subject of active research. † Silesauridae? ( paraphyletic?) īirds are avian dinosaurs, and in phylogenetic taxonomy are included in the group Dinosauria.ĭinosaurs are a diverse group of reptiles of the clade Dinosauria.
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