Statistical Analysis Shows Hobbits are New Human Species
 |
| Cast of a Homo floresiensis skull Courtesy of Ryan Somma/American Museum of Natural History |
Researchers have confirmed that
Homo floresiensis is a genuine ancient human species and not a descendant of healthy humans dwarfed by disease. Using statistical analysis on skeletal remains of a well-preserved female specimen, the Stony Brook University Medical Center researchers determined the small, hobbit-like creatures to be a distinct species.
In 2003, Australian and Indonesian scientists discovered small-bodied, small-brained, hominin (human-like) fossils on the remote island of Flores in the Indonesian archipelago. This discovery has spawned much debate, with some researchers claiming that they are really modern humans whose tiny head and brain are the result of a medical condition called microcephaly.
Researchers William Jungers and Karen Baab studied the skeletal remains of a female (LB1), nicknamed “Little Lady of Flores” or “Flo” to confirm the evolutionary path of the hobbit species. The specimen was remarkably complete and included skull, jaw, arms, legs, hands and feet that provided researchers with integrated information from an individual fossil.
The cranial capacity of LB1 was just over 400 cm, making it more similar to the brains of a chimpanzee or bipedal “ape-men” of East and South Africa. The skull and jawbone features are much more primitive-looking than any normal modern human. Statistical analysis of skull shapes shows that modern humans cluster together in one group, microcephalic humans in another, and the hobbit along with ancient hominins in a third.
 |
| Cave on Flores Island where skeletal remains were discovered. Courtesy of Rosino |
Due to the relative completeness of fossil remains for LB1, the scientists were able to reconstruct a reliable body design that was unlike any modern human. The thigh bone and shin bone of LB1 are much shorter than modern humans, including Central African pygmies, South African KhoeSan (formerly known as bushmen) and negrito pygmies from the Andaman Islands and the Philippines. Some researchers speculate this could represent an evolutionary reversal correlated with island dwarfing.
“It is difficult to believe an evolutionary change would lead to less economical movement,” said Jungers. “It makes little sense that this species re-evolved shorter thighs and legs, because long hind limbs improve bipedal walking. We suspect that these are primitive retentions instead.”
Further analysis of the remains using a regression equation developed by Jungers indicates that LB1 was approximately 106 cm tall (3 feet, 6 inches) — far smaller than the modern pygmies whose adults grow to less than 150 cm (4 feet, 11 inches). A scatterplot depicts LB1 far outside the range of Southeast Asian and African pygmies in both absolute height and body mass indices.
 |
| Flores Island in Indonesia, shown highlighted in red |
“Attempts to dismiss the hobbits as pathological people have failed repeatedly because the medical diagnoses of dwarfing syndromes and microcephaly bear no resemblance to the unique anatomy of
Homo floresiensis,” noted Baab.
Details of the study are published online in
Significance, the magazine of the Royal Statistical Society, and will appear in the December 2009 issue.
