mar 26, 530000000 BC - Pikaia

Description:

-oldest known chordates
-v-shaped pattern in fossil records

Sources:
http://eweb.furman.edu/~wworthen/bio440/evolweb/cambrian/pikaia.htm
https://evolution.berkeley.edu/evolibrary/images/pikaia_notochord.jpg

Added to timeline:

26 Oct 2018

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