An international team led by scientists from the Canadian Museum of Nature and the University of Chicago reconstructed the brain, heart, and fins of an extinct fish called Norselaspis glacialis from a tiny fossil the size of a fingernail and found evidence of change towards a fast-swimming, sensorily attuned lifestyle well before jaws and teeth were invented to better capture food.
Big heart, acute senses key to explosive radiation of early fishes, digital reconstruction indicates
