ScienceDaily -- Complex brains evolved much earlier than previously thought, as evidenced by a 520-million-year-old fossilized arthropod with remarkably well-preserved brain structures.
MORE: http://www.sciencedaily.com/releases/2012/10/121010131436.htm
See also...
Marine Worms Reveal the Deepest Evolutionary Patterns
http://www.sciencedaily.com/releases/2012/10/121009092533.htm
