Living hadrosaurs can be divided into two broad groupings. The neohadrosaurs are, despite their name (which refers to their diversity in the New World), the older and more conservative of the two and are found throughout the Americas and the eastern half of Eurasia (The other great hadrosaur group, the ungulapedes, will be dealt with later). They first appear at the start of the Eocene in North America and are probable descendents of flat-headed Maastrichtian giant saurolophinaes such as the well-studied and famous hadrosaur, Edmontosaurus annectens. In a very short space of time, the clade had spread into Eurasia and South America.
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