Fossil may be early example of hypothyroidism.
The ‘hobbit’ could be a cretin, Australian scientists say. But this latest assertion in the ongoing row over the identity of the small human skeleton found on the island of Flores in Indonesia is already being challenged — not least because the Australians used only cast images and never examined the actual skeleton. And they misinterpret a crucial skull component, according to three researchers who created casts of the remains.
Peter Obendorf of RMIT University in Melbourne and his colleagues say1 that the cast shows an impression (called a fossa) of an enlarged pituitary gland at the base of the skull behind the nasal region. This, they say, is evidence that the skeleton is not from a new species (called Homo floresiensis) but from a H. sapiens with cretinism — a condition in which a person is born with a deficient thyroid gland. Untreated, such people often have an enlarged pituitary gland as well as severely stunted growth and a small brain.
The Australians call their idea “a tentative hypothesis”, although Obendorf says he thinks they “are on the right track”. They now are seeking access to the original specimen.
But Dean Falk, an anthropologist at Florida State University in Tallahassee who was the lead author on the first analysis of the skull cast2, says that the pituitary fossa is small. “There is no way they can reach the conclusions they did,” she argues. And Ralph Holloway, a neuroanatomist at Columbia University in New York who has a cast created from data from the original skull, says that his model also shows a small pituitary.
I’m the only person on the planet to have seen what’s left of the pituitary fossa.
The disagreement highlights an often criticized practice whereby anthropologists examine secondary sources and publish conflicting reports, which many think clouds the course to verifiable results.
Since the discovery3 in 2003 of the skull and partial skeleton of H. floresiensis, the anthropology community has sprouted numerous theories to explain its characteristics. Just over 1 metre tall, the 18,000-year-old creature had a brain one-quarter the size of modern humans and primitive skeletal features similar to those of earlier human relatives. Stone tools have also been found in the same cave. Indonesia’s leading palaeoanthropologist, Teuku Jacob, then of the University of Gadja Mada in Yogyakarta, and his colleagues initially analysed the bones and decided that the creature, known as ‘the hobbit’, was in fact a human who had a developmental disorder called microcephaly, in which the head is smaller than usual4.
Palaeoanthropologist Peter Brown and archaeologist Michael Morwood, both of the University of New England in Armidale, Australia, stand by their proposal that the skeleton is a new species. Morwood notes that bones from 12 separate hobbits had been unearthed in the original Liang Bua cave, although so far only the one skull has been found. Brown is critical of the cretin theory. “I am the only person on the planet to have seen what’s left of the pituitary fossa,” he declares. “It is very poorly preserved and not capable of meaningful measurement.”
Last year, an Israeli team5 published a report proposing that the hobbit had a growth disorder called Laron syndrome. Those authors also never examined the original skeleton and their report was branded “a joke” by Falk, who is preparing a rebuttal for presentation at the annual meeting of the American Association of Physical Anthropologists on 9–12 April in Columbus, Ohio.
With just one skull, the row over whether the creature was a human with a congenital abnormality or a new species will probably continue for some time.
Obendorf, P. et al. Proc. R. Soc. B doi:10.1098/rspb.2007.1488 (2008).
Falk, D. et al. Science 308, 242-245 (2005).
Brown, P. et al. Nature 431, 1055-1061 (2004).
Jacob, T. et al. Proc. Natl Acad. Sci. USA 103, 13421-13426 (2006).
Hershkovitz, I., Kornreich, L. & Laron, Z. Am. J. Phys. Anthropol. 134, 198-208 (2007).
This article is from the print edition of Nature, 452, 12 (2008).
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Dalton, R. Hobbit was 'a cretin'. Nature 452, 12 (2008). https://doi.org/10.1038/news.2008.643