Humans Got Their Flexible and Sturdy Joints From Fishes, Evidence Found in 400 Million-Year-Old Jawed Fish Evolution has ...

While the common ancestor of vertebrates with synovial joints is still a mystery, the oldest specimen with evidence of these ...

A fossil analysis suggests that the yunnanozoan, a wormlike fish that flourished around 520 million years ago, sported structures that were the precursors of the head and jaws of modern vertebrates.