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Author Topic: The Homo floresiensis affair: Takeu strikes back?  (Read 2352 times)
Jacques Cinq-Mars
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« on: May 01, 2005, 08:24:07 AM »

All,

The palaeoanthropological “e-place” is already abuzz with the news that a whole community of live “little people” was recently discovered (?) on Flores, and, as it should, the gossip, trying to pass itself as scientific speculation, is already in full gear. Hence the title of this topic. Anyway, here is -- lifted from Carl Zimmer’s site -- what caused it all:

Quote
Hobbits Alive?

from The Loom, by Carl Zimmer
April 29, 2005


The feud over Homo floresiensis, the little people of Indonesia, centers on whether they were an extinct diminutive species that evolved from some ancient hominid, such as Homo erectus, or whether they were just pygmy humans, perhaps suffering from some disease. The leading skeptic, paleoanthropologist Teuku Jacob, has claimed that there are pygmies living not far from where the fossils were found, on the island of Flores. I came across a short item at Japan Today about a scientific expedition to study the pygmies, which was based on an article in Kompas, an Indonesian publication. The original article is here, and my intrepid brother Ben, expert on Indonesian anthropology (cultural, not paleo-), did an on-the-fly translation for me, which I'll run below. The team got back from Flores on April 25. While there, they went to a village called Rampasasa, made up of 77 families. About 80% of the people were pygmies. They measured 10 people who were a bit taller, with a height of 155 cm and 2 measuring 160 cm. Homo floresiensis was 130 cm. The researchers claim that these tall villagers got some extra height from having married non-pygmies from surrounding villages.

 <snip>

So here's the article...

The "Pygmy" Community of Flores

The existence of a community of pygmy people in the Manggarai Regency of  Flores, East Nusatenggara, is quite interesting but also quite mysterious.  In the context of the archaeological discovery of the prehistoric human skeleton from Liang Bua in Flores -- which has been published widely as belonging to the species named Homo floresiensis -- the existence of the pygmy community in the village of Rampasasa, Waemulu region, Waeriri subdistrict, could possibly shatter all previous arguments.

"The existence of the pygmy community there is quite interesting and also quite surprising. For many years, experts from various corners of the world have only had the chance to see their footprints, but it turns out we can now find them living in a society.  This means that for hundreds or maybe even thousands of years, this pygmy community has remained settled in that place without ever moving around," said Prof Teuku Jacob, emeritus professor at Gadjah Mada University.

Jacob, who also leads the Bio- and Paleo-Anthropology Laboratory at Gadjah Mada, further explained, "Pygmy people have indeed been reported as existing in the Andaman Islands and New Guinea, but only a few remain and it is difficult to find them because they live in dispersed conditions. Now we can find them living together in one village."

Since the 1920s, the East Nusatenggara region has been an object of interest for anthropologists, especially those from Holland, after seeing evidence that the residents there have rather short body height.  The results of the 1929 Biljmer study indicate that more than 50 percent of the residents of the region have body height of about 155 to 163 cm. Besides that, in Flores there have long circulated folk tales about short people with darkly colored skin (Negritos) who live in the hills, hiding in caves.

Dr. Theodore Verhoeven, pastor at the Ledalero Maumere Seminary, conjectured in 1958 that these short people were a Proto-Negrito community. This term refers to the Schebesta study in the Andamans, remote areas of Borneo (Kalimantan), and also the southern Philippines.

According to Teuku Jacob, if the height of the Negritos is roughly between 155 and 163 cm, they would be called pygmoid.  But if the Rampasasa people are true pygmies their height would have to be less than 145 cm for adult males and 135 cm for adult females.  The maximum weight would be 40 kg for males and 30 kg for females.

Pygmies are indeed different from dwarfs.  This is because the term dwarf indicates a small body with proportions that are out of order.  Pygmies, meanwhile, have small bodies that are proportional.

Since last year, the team working under the leadership of Prof. RP Soejono and Dr. MJ Morwood conducting an excavation in Liang Bua, Flores, has found human skeletons with an approximate height of 130 cm and with brains about a third of the size of modern humans. This discovery was later claimed to be a new species of humans called Homo floresiensis (Flores Man).

Worwood, an expert in cave paintings from Australia, in fact called the results of the discovery "hobbits" in a popular fashion, a group of pygmy people like those in the film Lord of the Rings.  The picture of miniature Flores Man then appeared as a major report in the April 2005 edition of National Geographic.

The above claim about the discovery of a new species was rejected by a number of experts.  Etty Indriati, a PhD from Gadjah Mada, called it a baseless tale.  How could there be a new species from the discovery of just one skeleton which in fact was misidentified?  They said it was a female while from the dental structure it was clear that it was a male, and also a modern one.

"What is more unreasonable, it is not possible that a brain that has already developed as Homo sapiens could then become small and develop into a new species, left behind as prehistoric remains," she explained.

Indeed, for mammals trapped in remote islands for hundreds of years -- and with insufficient food to eat -- bodies will become smaller as an adaptation to the environment. "But, for humans, their menu is not just one type of food.  Despite being isolated, they will try to find other types of food, so their bodies do not become small," she added.

Teuku Jacob explained, "The pygmy people of Flores are not a prehistoric race. Our team has successfully found a community of pygmies living in the modern world."  What is even more ironic, the community of pygmies mentioned by Jacob is only about 1 kilometer from Liang Bua, the dwelling place of the species given the name Homo floresiensis by Worwood.

Koeshardjono, an expert in biology who was the first to announce the existence of a pygmy community in Flores, stated, "This expedition was named the Rampasasa Pygmy Somatology Expedition.  This is because the pygmy community of about 77 families resides entirely in the village of Rampasasa, Waemulu region, Waeriri subdistrict, Manggarai regency, south Flores."

The results of the team of physical anthropologists led by Teuku Jacob recorded that 80 percent of the residents of Rampasasa are classified as pygmy.  The provisional findings indicate that there are 10 people with a height of 155 cm and two people with a height of 160 cm.  It turns out that their body size is relatively tall because of marriage with residents outside of the village.  The team of researchers from Gadjah Mada has been in Rampasasa since April 18 and returns to Yogya Sunday night (April 25).

Click HERE for the complete, original info.

Jacques Cinq-Mars


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Su Solomon
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« Reply #1 on: May 01, 2005, 11:45:19 AM »

What a strange world we live in :)

I too, am descended from short people, but am I a Hobbit or a pygmy?

My grandfather, who was born (1863) and bred in the East End of London reached the dizzy height of 4' 10": 147 cm, my grandmother was likewise constrained in her reach for the heavens (same environmental conditions as my Papa) and was even shorter, by a full 2 inches!

So, now anyone who is "short" is a pygmy and any hominoid who is not only short but has very long arms and an incredibly constrained brain is now a Hobbit?

And I havent even touched on the topic of "negritoes".

My, how anthropology has pro/re/gressed.

Who needs Carlton Coon, when we have Carl Zimmer.

Yours in subscience,

Su Solomon



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lagarvelho
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« Reply #2 on: May 01, 2005, 06:05:08 PM »

Su:

I've passed this article around to my Palanthsci group.  Quite frankly, I'm getting totally bewildered by the charges back and forth, and I must confess, I don't know *what* is going on any more.  These "pygmies" in that village are short, all right, but as you forcefully point out, there are lots of perfectly "normal" short human beings.  I'm on the short side myself(but not *that* short!).  Both my grandmothers were like this.  My sister and brother are more "normal", whatever that means.  But nobody says I'm a pygmy or a Negrito or whatever.  But then, I live in Seattle, Washington. . . .that might make a difference.  In any case, as far as "floresiensis" is concerned, I'm remaining "agnostic" until more substantial information on this matter turns up.
Anne G
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Su Solomon
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« Reply #3 on: May 03, 2005, 08:00:37 AM »

Ann,

As all we 'know' appears to come from the press and some people who claim to have some 'knowledge' of anthropology; all of  whom cant tell the difference between 'height challenged' people living in environmently challenging habitats and pygmies (who live in the Congo) what can you expect?

I have seen this 'article' of Carl Zimmer's before it was posted on this forum - a rather tacky piece of tacky journalism posing as science would be how I would classify it, and thats being generous.

As to H. flora (sounds like a margarine eh?)  well, who knows.   I think that it is a hyloblatid derivative (something like a Siamang) but you all know my opinion on this anyway.

Only time and DNA will tell us.

Cheers,

Su
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lagarvelho
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« Reply #4 on: May 03, 2005, 02:48:35 PM »

Su:

That is why I would be interested in seeing what, if any DNA comes out of these "floresiensis"  remains.  That would give the world a better idea of who or what they might actually have been.  As for the "pygmies". . . .well, I'll leave that part up to anyone who cares to read it, to decide. for themselves.
Anne G
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acd
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« Reply #5 on: August 16, 2005, 12:32:11 AM »

With morphological traits consistent to those of Homo erectus, Homo floresiensis are most likely ancestors who were isolated on the island of Flores by speciation and who through the process of natural selection developed their unique stature. It appears that this find raises questions about the genus Homos evolutionary capabilities based on its size and cranial capacities. What shocked scientists were the dwarfed characteristics of the bones. Standing at one meter tall and with an endocranial volume of 380cc, it resembles that of a modern day three year old child. This hominid also exhibits many primitive traits that can be compared to that of Australopithecus afarensis (similar to “Lucy” discovered by Donald Johanson), such as its endocranial volume and stature, including its broad pelvis, long femur and elongated arms. In contrast it has many more similar characteristics to that of the genus Homo; which include a deep prognathic facial skeleton, post canine tooth size, masticatory apparatus and adaptation, post cranial anatomy and habitual bipedalism. It is more appropriately a member of the genus homo as a result of this evidence. Which leads us to believe that survival of this Homo species into the Pleistocene is morphologically more adjustable in its adaptive responses than previously thought. Several theories on the existence and evolution of these people have evolved over the past year because of their diminutive stature. Many scientists, including the excavators present at the time of the find, believe that this hominid belongs to a new species, Homo florensiensies because of the combination of primitive and acquired attributes. They suggest that its bantam size was the result of insular dwarfing, previously only found in mammals larger than rabbits as a reaction to specific ecological environments. This is a case where natural selection favours the smaller size of an individual in a hot climate based on thermoregulatory advantages either through evaporative cooling or reduced internal rates of heat production. On the other hand skeptics question the authenticity on such claims, arguing that this individual was actually a Homo sapien that was most likely affected by a genetic disorder called microcephaly which is distinguished by a small head and brain. The disorder is such that, while the head of the individual fails to grow the face continues to develop at a normal. A comparison of a fossilized example of a Homo sapien affected by this condition can be found in a 4000 year old skull discovered at Crete with many similar characteristics. The sloped face and appearance of no chin are identical on both skulls which is also another trait of microcephaly. Also based on this theory is the notion that the entire population of these Homo sapiens contracted this as a viral epidemic that swept the island or that they were banned to the island because of their odd appearances. Still another theory was that they had stumbled across a population of pygmies Homo sapiens. This claim was based on their meager size and similar characteristics to that of Homo sapiens.

Although many of these theories have some merit and credibility, they can for the most part be disproven. For example, the theory regarding microcephaly is almost inconceivable because the suspect species found had reached an age of 30 years old, where as most infected individuals barely reach their teens. It may be argued that the survival of this diseased individual could be an exception to the rule but since that lower jaw of another individual was also discovered in the cave; identical in size, it would be hard to except the idea of two individuals both affected be this disease and collectively induring decomposition over the thousands of years until discovery. Resulting affects of this genetic disease include mental retardation and motor ability fluctuating anywhere from clumsiness to spastic quadriplegia. So the idea that the entire population contracted this as a viral epidemic is impossible when their survival relied on collective hunting, sophisticated toolmaking and communication. In seeing what this population accomplished including possible sea faring capabilities, stone artefact technology, colonization on Flores and survival on an isolated island, it’s hard to conceive them achieving all of this with microcephaly. The concept of this hominid being a pygmy, can be refuted because pygmyization of an individual is the result of delayed growth of the body at puberty; the outcome of reduced levels of insulin production, after the brain has fully developed to a normal size. Where as in this case, the skull in question is one third the size of a normal homo sapien, which ranges from 1000 to 2000 cc’s. Moreover, the skull differs from that of a pygmy because of shape, robusticity and features of the skull base. This previous claim may have been determined due to the fact that many people find it hard to fathom that a population of such small brained hominids were capable of making such advanced tools and yet were not Homo sapiens. Scientists are now examining the theory that once a brain reaches a certain size all that matters is the internal wiring of the brain; so larger brains may no longer be smarter brains. It’s all based on how it is put together. The most likely explanation for this tiny hominid appearance is that through natural selection; its small size was chosen as an advantage on the island. Through the process of  insular dwarfing or island dwarfing, which minimizes body size in specific ecological environments, such as islands it allowed this species to become more successful. This adaptive response occurs because of limited food supply and fewer predators in a specific niche. Evidence of this selection can be seen in the remains of the stegonon, an extinct proboscidean, which originally were the size of an elephant, and over time responded to a more adaptively successful size. Survival on an isolated island would rely on minimal daily energy requirements resulting in an advantageous smaller size. Which in turn is how this group accomplished survival and thrived on Flores from 95 000 to 13 000 years ago. This time frame corresponds with the excursion of Homo erectus out of Africa to the island of Java, which they occupied up until 25 000 years ago. Since this archaic hominids morphological features are similar to those of Homo erectus it is not unreasonable to place them as the decedents of that species of homo. Evidence of the possibility of Homo erectus being an ancestor has been documented by a recent find of a miniature Homo erectus skull in Kenya. It shows that Homo erectus was capable of changing size under the right circumstances. This could also be a possible example of punctuated equilibrium, where there is a sudden and drastic change in the evolution of a new species.

Through careful consideration of all of these theories and their conclusions, the theory of Ockham’s Razor or the law of Parsimony can be put into place. Which means, “no more things should be presumed to exist than are absolutely necessary”. The most logical explanation of the origin of this new species should be associated with the excursion of Homo erectus into Java, until they were isolated on the island of Flores and over time responded to the islands adaptive needs by decreasing in size . Science can’t evolve if we base everything on what we already know; expansion of out ancestral lineage is undeniable.




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Robert Henvell
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« Reply #6 on: August 16, 2005, 02:37:57 PM »

Does anyone have a link to the minature Homo erectus skull that was found in Kenya?
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lagarvelho
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« Reply #7 on: August 16, 2005, 06:15:41 PM »

Robert:

What "miniature Homo erectus skull"?  When and where is it supposed to have been found?
Anne G
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Robert Henvell
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« Reply #8 on: August 17, 2005, 12:24:14 AM »

Anne,
It is the minature skull,which is mentioned in the article that was posted above my query.Have no knowledge of it--hence my request.
Bob
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richard01
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« Reply #9 on: August 17, 2005, 02:43:01 PM »

Robert - this may be the 'very small' h erectus skull that Rick Potts found last year at Olorgesailie. He talks about it (in very general terms) somewhere in these two URLs

1999 Season
http://www.mnh.si.edu/anthro/humanorigins/aop/olorg1999/index.htm

http://tinyurl.com/8gpbm


2004 Season
http://www.mnh.si.edu/anthro/humanorigins/aop/olorg2004/index.htm

http://tinyurl.com/b93wr

regards

Richard
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Robert Henvell
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« Reply #10 on: August 17, 2005, 03:42:26 PM »

Richard,
Thank you for the links.Unfortunately their small hominid also seems to be an enigma.
Bob
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John Hawks
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« Reply #11 on: August 17, 2005, 03:45:08 PM »

Does anyone have a link to the minature Homo erectus skull that was found in Kenya?

I have a short writeup on my weblog. The specimen is KNM-ER 42700, its endocranial volume is 691, but it is a kid, so the adult size would have been higher, perhaps 720.

--John
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