Analog
Lifer
he transfer occurred about 3.3 million years ago, said study leader David Reed, of the University of Florida in Gainesville. That's when the gorilla louse and the human pubic louse separated into distinct species, the research revealed.
Modern humans (Homo sapiens) weren't around at the time. So the first to be infested by the new lice species were probably Australopithecus, a group of human ancestors that include the famous "Lucy" fossil.
Prior to the transfer our ancestors were troubled by only one species of body louse, as chimpanzees and gorillas are today. Why humans can harbor two species?head lice and pubic lice?has been a mystery until now.
The discovery raises the same vexing question faced by anyone who has contracted pubic lice: How exactly did this happen?
Pubic lice are spread most commonly through sexual contact, but that's not necessarily how our ancestors acquired the parasite from gorillas.
"Unfortunately, we'll never know for sure," Reed said. "Given that the [gorilla louse] species occurs primarily in the pubic region, it is quite possible that the lice were transmitted sexually."
http://news.nationalgeographic.com/news/2007/03/070316-gorilla-lice.html
Modern humans (Homo sapiens) weren't around at the time. So the first to be infested by the new lice species were probably Australopithecus, a group of human ancestors that include the famous "Lucy" fossil.
Prior to the transfer our ancestors were troubled by only one species of body louse, as chimpanzees and gorillas are today. Why humans can harbor two species?head lice and pubic lice?has been a mystery until now.
The discovery raises the same vexing question faced by anyone who has contracted pubic lice: How exactly did this happen?
Pubic lice are spread most commonly through sexual contact, but that's not necessarily how our ancestors acquired the parasite from gorillas.
"Unfortunately, we'll never know for sure," Reed said. "Given that the [gorilla louse] species occurs primarily in the pubic region, it is quite possible that the lice were transmitted sexually."
http://news.nationalgeographic.com/news/2007/03/070316-gorilla-lice.html
