WHAT?! A Massive Dinosaur Family Tree Rewrite

Ask any obsessive dino-phile above kindergarten age to explain the dinosaur family tree and it’s likely the first thing you’ll hear is that all dinosaur species fall into one of two groups. It’s a core concept upon which our entire understanding of dinosaurs is built. But according to a new study, we got that most fundamental aspect of dinosaur evolution completely wrong. Oops.

For more than a century, the dinosaur family tree was understood as having a very early split into two branches:

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