Researchers have discovered a 380-million-year-old heart and other organs in the fossil of an ancient jawed fish collected in Western Australia's Kimberley region.
Experts say it is the oldest three-dimensionally preserved fossil heart ever found in a jawed vertebrate, shedding new light on the evolution of humans.
The research, published in the Science journal on Friday, finds the position of the organs in the body of arthrodires - an extinct class of ancient armoured fish - is similar to modern shark anatomy.
