Prehistoric Fish Fossil Reveals Oldest-Known Vertebrate Brain

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he fossilized skull of a fish, next to a penny for scale, with the oldest preserved brain of a vertebrate (Credit: Jeremy Marble/ University of Michigan News)

The recent discovery of the oldest-known vertebrate brain is giving scientists valuable insights into the evolution of the ray-finned fish species. The diverse group comprises about 50 percent of living vertebrate species. They include everything from trout to salmon and goldfish to seahorses.

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