Evolution - Reality and Misconceptions

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ash73 said:

Not quite it's suggesting 90% of all current species evolved about 200K years ago. We knew modern humans emerged about then, but not all current species.

I wonder if you went back 200,000 years and looked at mitochondrial DNA diversity you would see a similar trend, in that 90% of species in existence 200,000 years ago had all evolved in the preceding 200,000 years?