Scientists have found a few bones and seven teeth belonging to a previously unknown species of human. They’ve named the new species Homo luzonensis, after the island of Luzon in the Philippines where it was found.
The bones are tiny, suggesting that Homo luzonensis was under 4 feet tall. That would make it the second species of diminutive human to be found in south-east Asia; in 2007 scientists announced the discovery of Homo floresiensis, found on the island of Flores in Indonesia and nicknamed the hobbit. Both species lived around 50,000 years ago, at a time when Asia was also home to our species, the Neanderthals and a group called the Denisovans.
The new species raises many questions, including who were its ancestors and how did it move?
Read the research paper here: https://www.nature.com/articles/s4158…
Thanks to Rob Rownd (UPFI and UP-ASP) for the excavation footage. The 3D animations were provided by the Callao Cave Archaeology Project.
New species of early human found in the Philippines
by The Australian National University
An international team of researchers have uncovered the remains of a new species of human in the Philippines, proving the region played a key role in hominin evolutionary history.
The new species, Homo luzonensis is named after Luzon Island, where the more than 50,000 year old fossils were found during excavations at Callao Cave.
Co-author and a lead member of the team, Professor Philip Piper from The Australian National University (ANU) says the findings represent a major breakthrough in our understanding of human evolution across Southeast Asia.
The researchers uncovered the remains of at least two adults and one juvenile within the same archaeological deposits.
“The fossil remains included adult finger and toe bones, as well as teeth. We also recovered a child’s femur. There are some really interesting features – for example, the teeth are really small,” Professor Piper said.
“The size of the teeth generally, though not always, reflect the overall body-size of a mammal, so we think Homo luzonensis was probably relatively small. Exactly how small we don’t know yet. We would need to find some skeletal elements from which we could measure body-size more precisely.
“It’s quite incredible, the extremities, that is the hand and feet bones are remarkably Australopithecine-like. The Australopithecines last walked the earth in Africa about 2 million years ago and are considered to be the ancestors of the Homo group, which includes modern humans. Read full article at Phys.org
A new species of Homo from the Late Pleistocene of the Philippines
The remains of the “second cousin” of modern man who have not been discovered before are an estimated 50,000 years old.Anthropologists have named the species Homo luzonensis, referring to the place of the find.The discovery will be published tomorrow in scientific magazine Nature.
A hominin third metatarsal discovered in 2007 in Callao Cave (Northern Luzon, the Philippines) and dated to 67 thousand years ago provided the earliest direct evidence of a human presence in the Philippines. Analysis of this foot bone suggested that it belonged to the genus Homo, but to which species was unclear.
Here we report the discovery of twelve additional hominin elements that represent at least three individuals that were found in the same stratigraphic layer of Callao Cave as the previously discovered metatarsal. These specimens display a combination of primitive and derived morphological features that is different from the combination of features found in other species in the genus Homo (including Homo floresiensis and Homo sapiens) and warrants their attribution to a new species, which we name Homo luzonensis. The presence of another and previously unknown hominin species east of the Wallace Line during the Late Pleistocene epoch underscores the importance of island Southeast Asia in the evolution of the genus Homo.
Note: The data that support the findings of this study are available from the corresponding authors upon reasonable request. Homo luzonensis has been deposited in the ZooBank database (http://zoobank.org/) with Life Science Identifier urn:lsid:zoobank.org:act:4F743862-662F-4E6B-9812-8A05533C1347. The description of the species has been deposited with Life Science identifier urn:lsid:zoobank.org:pub:0E4607F1-1374-4842-B32B-7CE2250807DF.
Article down bellow we shared from TheScientist.com
New Species of Human, Homo luzonensis, Identified in the Philippines
Thirteen hominin bones found in a cave are so unique that archaeologists have determined they stem from a distinct hominin species, although others question whether the researchers have enough evidence.
Apr 10, 2019 by Katarina Zimmer
In 2007, archaeologist Armand Salvador Mijares found a curious bone buried in Callao Cave in the Philippine island of Luzon. Shortly after, he and his colleagues concluded it was a third metatarsal from an human that lived some 67,000 years ago. Together with other findings, it demonstrated that humans could cross the open ocean and reach isolated islands very early on in our history.
But whether that bone belonged to Homo sapiens or another species of our genus was a mystery. Mijares, of the University of the Philippines, and his colleagues have since discovered twelve additional bones and teeth from the same site. Their analysis has revealed that the remains are unlike any other hominin fossils known, and likely represent a distinct species of the Homo genus. The researchers named it Homo luzonensis, they report today (April 10) in Nature.
“It’s fantastic news. It’s not every day you get to name a new species within the human family tree,” remarks Michael Petraglia, a professor of human evolution and prehistory at the Max Planck Institute for the Science of Human History who wasn’t involved in the study. “The work is very strong, very robust, and they have convinced me that we’re probably looking at a new species within our genus.”
Altogether, the team—a group of French and Australian researchers, as well as Mijares himself—found a partial femur, two hand phalanges, two feet phalanges, and seven teeth, from at least three individuals. They dated one of the molars to a minimum age of 50,000 years, slightly younger than the metatarsal. They weren’t able to extract any DNA from the fossils, making it impossible to conduct phylogenetic analyses. Instead they base their conclusions on detailed examination of the remains, using a range of techniques including traditional measurements, micro CT scans, and 3-D morphometric analyses.
Two premolar and three molar teeth proved especially useful because they stemmed from the same individual. The molars had modern features reminiscent of H. sapiens and Asian H. erectus teeth, but they were too small to have stemmed from H. sapiens individuals. The premolars, on the other hand, could have stemmed from H. sapiens if one only considered their size. But these also had two or three roots—a characteristic regarded as primitive. These unique combinations of characteristics weren’t present in any known hominin fossils, explains Florent Détroit, a paleoanthropologist at the Muséum National d’Histoire Naturelle in Paris and a coauthor on the new study.
The hand and foot phalanges puzzled the researchers, as some of them strikingly resembled those of an Australopithecus species, a hominin known from the African fossil record that lived up until 1.5 million years ago. “If we told people that we discovered them in Ethiopia in layers dated to 3 million years ago, everybody would agree with us [that] it’s really Australopithecus,” Détroit remarks. But to see such specimens in the Philippines from only 50,000 years ago is unexpected. The morphologies of Australopithecus hand and feet bones are thought to reflect varying degrees of climbing behavior or bipedalism, but it’s not yet clear how H. luzonensis may have moved, he adds.
To Détroit, the findings suggest that isolation on islands can drive speciation in humans in the same way it does for other vertebrate species. “I’m almost a hundred percent sure that [the unique combination of features] we are observing in H. luzonensis is also due to the effects of insular endemism,” he says.
CALLAO CAVE ARCHAEOLOGY PROJECT
The Callao Cave fossils aren’t the earliest evidence of humans on Luzon: In 2018, researchers found a set of stone tools beside the remains of a butchered rhinoceros, just 20 kilometers away from the cave. They estimated these were around 709,000 years old. That would be enough time to evolve the unique characteristics the team observed in H. luzonensis, Détroit says, but it’s not clear if H. luzonensis descended from those early hominins.
Some researchers question whether the evidence is enough to warrant a new species designation. “I think it is a really interesting set of remains, but it’s really at the lower end of the amount of evidence that you would want to base a new species on,” says Bernard Wood, a professor who studies human origins at George Washington University and wasn’t involved in the study.
There could be other explanations for the unique combination of tooth features, he says. The group of individuals that reached Luzon was likely a random assortment of genotypes. With inbreeding over time, genetic drift could have pushed them to develop the unique characteristics that Détroit and his colleagues observed. So there’s a possibility that the remains represent merely an unusual island population of individuals, rather than a new species, Wood explains.
It’s also unclear what kind of hominin they descended from to begin with, he notes. H. floresiensis, an extinct hominin discovered on the Indonesian island Flores in 2003 and nicknamed “the hobbit” for its small size, is thought to have descended from a primitive hominin. But for the hominin in Luzon, “it’s hard to tell whether this is a primitive-looking, relatively modern hominin, or an older hominin whose molars happen to have become like the molars that you would find in modern humans.”
That the remans may not represent a distinct species is “a possibility you certainly have to entertain,” says Petraglia, “but I think that they have enough variability in the fossils to show that it probably is another species,” he says. For him, the findings raise several interesting questions. Did H. luzonensis interbreed with other hominins? What happened to them? Were they simply outcompeted when H. sapiens arrived much later? The Philippines was never connected by a land bridge to the mainland, “so it raises an immediate question as to how did they get there: was it intentional or not?”
Some researchers have suggested that other island hominins, such as H. floresiensis, arrived afloat some kind of raft or rudimentary boat. Meanwhile, others argue that early hominins weren’t clever enough for that, and that it’s more likely they arrived by chance—for instance, by getting swept away on tangles of mangroves during a tsunami. Some modeling work has shown that it would be possible to establish independent human populations on an island through successive, accidental arrivals, but the probability of that happening is very low, Détroit notes. His team’s discovery of yet another island hominin, as well as others’ recovery of ancient stone tools on other islands such as Sulawesi, make him think it might not be purely accidental. “But it’s a lot of speculation,” he adds.
To answer these questions will take more digging—which is exactly what Détroit thinks we need in the region. Fifteen years ago, researchers had a very simplistic narrative of human evolution in Asia, he notes: H. erectus migrated there from Africa, and settled there until they were replaced by H. sapiens. “Now the situation is totally different,” he says. “It’s clearly a much, much more complex picture of hominin evolution in Asia.”
F. Détroit et al., “A new species of Homo from the Late Pleistocene of the Philippines,” Nature, doi:10.1038/s41586-019-1067-9, 2019.
