Oldest known sex chromosome emerged 248 million years ago in an octopus ancestor
The oldest-known sex chromosome emerged in octopus and squid between 455 million and 248 million years ago — 180 million years earlier than the previous record-holder, scientists have discovered.
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Cephalopods are so much cooler than we give them credit for. These guys sex!
For some weird reason, I'm picturing Roger from American Dad.