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Wed 6 Oct, 2004 04:27 am
A study of headlice show they originated about 1.8 million years ago,about the time HOMO ERECTUS appeared on the scene,and they evolved along with the human race.
I suspect they have been around longer than that. Give us the link to this study Boy!
They are 2 distinct genetic lines of Pediculus humanus,one is found only in the Americas,which they think probably evolved on an earlier extinct human species.
SOURCE GUARDIAN 2.