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The oldest known example of male genitalia in animals comes from a 400 million year old fossil of a harvestman, or “daddy longlegs.”

Harvestmen are one of the earliest groups to evolve fully modern body parts. The above picture is a high-resolution X-ray of a harvestman fossil.--Click for journal source

Yes, the earliest example of a penis that we know of comes from a daddy longlegs, and there’s probably one lurking around in your basement as we speak.

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