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nov 18, 320000000 BC - Beginning of pelycosaur reign

Description:

Pelycosaurs are a sister group to all other synapsids. They show some mammal-like characteristics, and often have "sails," presumably to aid in thermal regulation. Therapsids branched off from pelycosaurs, and the two remained in competition until about 275 mya.

Added to timeline:

Chordate Evolution over Geologic Time

ByZahur Ashrafuzzaman
26 Jan 2018
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0
1676

Date:

nov 18, 320000000 BC
Now
~ 5883516 years ago
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