https://kids.guinnessworldrecords.com en

First complete animal nervous system

First complete animal nervous system
Who
Alalcomenaeus sp.
What
First
Where
China
When
2013
The earliest known complete animal nervous system is perfectly preserved in a recently studied fossil of a 3-cm-long, hitherto-unknown species of segmented-bodied marine arthropod that is an ancestor of present-day chelicerates (spiders, scorpions, horseshoe crabs). Belonging to the long-extinct genus Alalcomenaeus, it lived more than 520 million years ago during the Lower Cambrian Period in seas now occupied by southwest China.