Sunday, November 21, 2010
LARS THOMAS: Analysis of the orang pendek hairs collected in Sumatra during the 2009 expedition
In late 2009 I was given a sample of hairs collected in Sumatra earlier that year by Adam Davies, Richard Freeman and several others taking part in the expedition searching for evidence of the elusive orang pendek, the Indonesian “abominable snowman.”
A small part of the hair sample was subjected to a DNA-analysis, but due to the small amount of DNA extracted and the rather poor condition of it, no firm conclusion could be reached. The DNA did show some similarities to primate DNA, possibly orangutan, but no definite results could be obtained.
Following this I subjected the remaing hairs to a structural analysis to see if this could bring any information to light that might reveal the identity of the owner of the hairs.
I checked all of the remaining 6 hairs and they were all consistent with hairs from large primates or humans. They all had the rather large medulla with a lot of pigmentation typical of large primates, and the intermittent holes in the centre of the hairs, making them look somewhat like hollowed out tree trunks. I compared the hair samples with reference samples of 3 different species of gibbon, orangutan, chimpanzee and bonobo, gorilla and some 15 samples of human hairs in various colours, mainly red or reddish. I was never able to ascertain their identity with total certainty, although I could eliminate some. The hairs were not modern human, and they were not from siamangs or other gibbons. They have a very deep rusty-red colour, very similar to the colour of orangutan hairs, but varied in other structural details.
So based on these results alone I concluded that the hairs were from something closely related to orangutans or from a form of orangutan I had not seen before.
In the autumn of 2010 Tom Gilbert from the DNA Laboratory of the University of Copenhagen did a further DNA test of the remaining hairs. In this case he was able to extract a good amount of DNA enabling him to conclude that whoever used to wear these hairs were either human of very closely related to humans.
So the structural analysis point to either an orangutan or something very closely related to an orangutan. The DNA analysis on the other hand point to a human or something very closely related to humans.
Based on this information I am forced to conclude that Sumatra is home to a completely new species of large primate, but I am also well aware that these results can in no way be called conclusive evidence of the existence of these animals. But it should be more than enough reason for a new expedition to go back to the area, hopefully obtaining enough evidence and samples to come to a final conclusion.
A small part of the hair sample was subjected to a DNA-analysis, but due to the small amount of DNA extracted and the rather poor condition of it, no firm conclusion could be reached. The DNA did show some similarities to primate DNA, possibly orangutan, but no definite results could be obtained.
Following this I subjected the remaing hairs to a structural analysis to see if this could bring any information to light that might reveal the identity of the owner of the hairs.
I checked all of the remaining 6 hairs and they were all consistent with hairs from large primates or humans. They all had the rather large medulla with a lot of pigmentation typical of large primates, and the intermittent holes in the centre of the hairs, making them look somewhat like hollowed out tree trunks. I compared the hair samples with reference samples of 3 different species of gibbon, orangutan, chimpanzee and bonobo, gorilla and some 15 samples of human hairs in various colours, mainly red or reddish. I was never able to ascertain their identity with total certainty, although I could eliminate some. The hairs were not modern human, and they were not from siamangs or other gibbons. They have a very deep rusty-red colour, very similar to the colour of orangutan hairs, but varied in other structural details.
So based on these results alone I concluded that the hairs were from something closely related to orangutans or from a form of orangutan I had not seen before.
In the autumn of 2010 Tom Gilbert from the DNA Laboratory of the University of Copenhagen did a further DNA test of the remaining hairs. In this case he was able to extract a good amount of DNA enabling him to conclude that whoever used to wear these hairs were either human of very closely related to humans.
So the structural analysis point to either an orangutan or something very closely related to an orangutan. The DNA analysis on the other hand point to a human or something very closely related to humans.
Based on this information I am forced to conclude that Sumatra is home to a completely new species of large primate, but I am also well aware that these results can in no way be called conclusive evidence of the existence of these animals. But it should be more than enough reason for a new expedition to go back to the area, hopefully obtaining enough evidence and samples to come to a final conclusion.
http://forteanzoology.blogspot.com/2010/11/lars-thomas-analysis-of-orang-pendek.html
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