A newly discovered brain in a 525-million-year-old arthropod fossil looks to be the oldest found so far – and it may have settled an ongoing debate about how brains first evolved in these invertebrate animals.
, the surprise is that the brain survived at all and that it was made up of three components distinct from the nervous system.
It had previously been thought that the brains of these creatures were split into repeating segments of neural structures called ganglia, just like the nervous system in the trunk.
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