Smart mouth — China fish fossil sheds light on jaw evolution

A bottom-dwelling, mud-grubbing, armored fish that swam in tropical seas 423 million years ago is fundamentally changing the understanding of the evolution of an indisputably indispensable anatomical feature — the jaw. Scientists in China’s Yunnan province said on Thursday they had unearthed fossils of a primordial fish called Qilinyu rostrata that was about 30 centimeters long and […]