Diminutive humans that died out on an Indonesian island about 15,000 years ago were not Homo sapiens, but a different species, according to a study published on Monday that dives into a fierce anthropological debate.
Fossils of Homo floresiensis — dubbed “the hobbits” due to their tiny stature — were discovered on the island of Flores in 2003. Controversy has raged ever since as to whether they are an unknown branch of early humans or specimens of modern man deformed by disease.
The new study, based on an analysis of the skull bones, shows once and for all that the pint-sized people were not Homo sapiens, according to the researchers.
Academic studies have come to different conclusions — and scientific discourse has sometimes tipped over into acrimony.
One school of thought holds that so-called Flores Man descended from the larger Homo erectus and became smaller over hundreds of generations.
The proposed process for this is called “insular dwarfing” — animals, after migrating across land bridges during periods of low sea level, wind up marooned on islands as oceans rise and their size progressively diminishes if the supply of food declines.
An adult hobbit stood 1m tall, and weighed about 25kg.
Similarly, Flores Island was also home to a miniature race of extinct, elephant-like creatures called Stegodon.
However, other researchers say that Homo floresiensis was in fact a modern human whose tiny size and small brain — no bigger than a grapefruit — was caused by a genetic disorder.
One suspect was dwarf cretinism, sometimes brought on by a lack of iodine. Another potential culprit was microcephaly, which shrivels not just the brain and its boney envelope.
Weighing in with a new approach, published in the Journal of Human Evolution, a pair of scientists in France used high-tech tools to re-examine the layers of the “hobbit” skull.
More precisely, they looked at the remains of Liang Bua 1 (nicknamed LB1), whose cranium is the most intact of nine known specimens.
“So far, we have been basing our conclusions on images where you don’t really see very much,” said lead author Antoine Balzeau, a scientist at France’s Natural History Museum.
Joining forces with Philippe Charlier, a paleo-pathologist at Paris-Descartes University specializing in solving ancient medical mysteries, the researchers secured high-resolution images recently generated in Japan to compute maps of bone thickness variation.
“There is a lot of information contained in bone layers of the skull,” Balzeau said.
The results, he said, were unambiguous: “There were no characteristics from our species” — that is, Homo sapiens.
While they found evidence of minor maladies, there was nothing corresponding to the major genetic diseases other researchers had pointed to.
However, while the scientists could not exclude the possibility that the “hobbit” was a scaled-down version of Homo erectus, which arrived on the neighboring island of Java about 1 million years ago, nor could they be sure that Homo floresiensis was not a species it its own right.
“For the moment, we can’t say one way or the other,” Balzeau said.
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