Researchers have discovered a 380-million-year-old heart — the oldest ever found — alongside a separate fossilised stomach, intestine and liver in an ancient jawed fish, shedding new light on the evolution of our own bodies. The new research, published today in Science, found that the position of the organs in the body of arthrodires — an extinct class of armoured fishes that flourished through the Devonian period from 419.2 million years ago to 358.9 million years ago — is similar to modern shark anatomy, offering vital new evolutionary clues.
— source Curtin University | Sep 15, 2022