International Dinosaur Discoveries

Early Dinosaur History Outside the United States

Who first classified dinosaurs based on the structure of the pelvic area?

In 1887, English paleontologist Harry Seeley (1839–1909) realized there were two distinct groups of dinosaurs. He classified them as Ornithischia (bird-hipped) and Saurischia (lizard-hipped), basing this primarily on the bone structure of the pelvic area. This system of classification was widely adopted and is still in use today.


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