Fossilized brain of 525 million-year-old deep sea worm likely the oldest ever discovered - Livescience.com

An ancient worm unearthed in China has one of the oldest fossilized brains ever found. The brain's shape could also help solve a centuries-old debate about the evolution of arthropods.An abstract artist's impression of what the fossilized worm, Cardiodictyon catenulum, may have looked like.  (Image credit: Nicholas Strausfeld/The University of Arizona) (opens in new tab)A 525 mil