A new, gorgeous assemblage of fossils found in southern China offers an unprecedented window into the earliest evolution of jawed vertebrates.
were fish, and they did it around 480 million years ago . Genetic analyses have suggested that by about 450 million years ago, those fish also developed jaws, the better to chomp each other with. But the earliest complete fossils of such jawed fish appear relatively late in the fossil record, about 425 million years ago.
were found at the Chongqing site. Those finds make the animal the most abundant type of fish in that fossil assemblage.was only about 30 millimeters long, about the length of a paper clip, but it bears a strong resemblance to larger armored placoderms to come in the future: It had a broad, bony head shield and a body covered in small, diamond-shaped scales. has allowed researchers to reconstruct the fish’s anatomy in detail.
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