436 million years old fish fossil found in Chongqing

Jawless fish endemic to East Asia

Though also a kind of fish, Binhai Yongdong fish is remarkably different from modern fish in shape.

"We can describe it as 'bizarre,'" said Chen while raising the fossil in his hands. On the fossil, the most eye-catching part is the "helmet" on the fish head.

The "helmet" looks very similar to the head armor worn by ancient soldiers at first sight, and there are two holes on it: the eye sockets of Binhai Yongdong fish.

Substantial morphological analysis has proven that the archaic fish living in Chongqing 436 million years ago has filled the morphological gap between the two important morphological types of Sinogaleaspis and Eugaleaspiformes and shed more light on how Eugaleaspiformes evolved morphologically.