I just saw an ant outside as I was getting home, and couldn't help but wonder how long ago we shared a common ancestor. We're both eukaryotes, although I'm a chordate and she's an arthropod. We're both coelomates, however. The first coelomates were the Vernanimalcula, which lived some 580 to 600 million years ago. Be that as it may, humans' ancestors (or those organisms that would one day branch off into primates) and insects' ancestors (those that would become arthropods) might have more recent ancestry of only a few hundred million years.
I'd invite the ant in for an extended family get-together, but I wanted to know who are most recent ancestor was first. It'd make for good conversation at our next family reunion. ;)
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