This illustration shows Qilinyu, a 423-million-year-old fish from the Kuanti Formation (late Ludlow, Silurian). Paleontologists from China and Sweden said Thursday that our jaws can be traced back to these extinct armored prehistoric fish that dominated the oceans, rivers and lakes over 400 million years ago. The findings, published in the U.S. journal Science, were based on a newly discovered fossil fish in Yunnan, southwest China, known as Qilinyu, which is part of the ancient armored fish. (Photo/Xinhua)
