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Evolution and Classification Dinosaurs first appeared in the Triassic Period, about 230 million years ago, evolving from small, agile reptilian ancestors called dinosauromorphs The Fact Site +1 . They flourished through the Mesozoic Era, which spanned roughly 180 million years and included the Triassic, Jurassic, and Cretaceous periods American Museum of Natural History +1 . Dinosaurs are divided into two major groups based on hip structure: Saurischia (lizard-hipped), which includes most carnivores and long-necked herbivores, and Ornithischia (bird-hipped), primarily herbivores. Interestingly, modern birds evolved from the lizard-hipped theropods Factinate . This is the About section.
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