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It was the first evidence that this type of dinosaurs lived during the Late Jurassic era, about 160 million years ago.
Halfway between birds and dinosaurs, this group -- which George Washington University doctoral candidate Jonah Choiniere named Haplocheirus sollers (meaning skillful hand) in his study published in Friday's issue of the journal Science -- looks a bit like today's gamefowl.
It also had a long neck and head, as well as extended, hairless limbs. The claw may have been used for digging termites.
"Haplocheirus is a transitional fossil, because it shows an early evolutionary step in how the bizarre hands of later Alvarezsaurs evolved from earlier predatory dinosaurs," Choiniere said in a statement.
"The fossil also confirms our predictions that Alvarezsauridae should have been evolving in the Late Jurassic time period."
The fossil of the newly discovered species has several features linking it to Alvarezsauridae, which included species like Mononykus (meaning one claw) and was previously thought to be a flightless offshoot of ancient birds.
But despite the Alvarezsauridae's skeletal similarities to ancient birds, Choiniere's findings showed that the dinosaur family evolved in parallel to birds and was not descended from them.
The Late Jurassic period played a key role in the evolution of birds. Some evidence suggests birds first evolved from theropod (bird-footed) dinosaurs -- the ancestors of predator dinosaurs like T. rex.
The nearly complete Haplocheirus sollers specimen skeleton, which measures ten feet (three meters) long, was collected in 2004 during expeditions to China's remote northwestern Xinjiang region by James Clark of The George Washington University and Xu Xing of the Chinese Academy of Sciences, who co-wrote the study.
"The primary goal of our expeditions was to find evidence of the theropod dinosaurs closest to birds, and the discovery of Haplocheirus is one of our major discoveries," said Clark.
"This spectacular skeleton shows how the strange arms of Mononykus and other Alvarezsaurs evolved from a more typically theropod grasping hand."
The National Science Foundation (NSF) Division of Earth Sciences, the National Geographic Society, the Chinese National Science Foundation and The George Washington University funded the research.
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Halfway between birds and dinosaurs, this group -- which George Washington University doctoral candidate Jonah Choiniere named Haplocheirus sollers (meaning skillful hand) in his study published in Friday's issue of the journal Science -- looks a bit like today's gamefowl.
It also had a long neck and head, as well as extended, hairless limbs. The claw may have been used for digging termites.
"Haplocheirus is a transitional fossil, because it shows an early evolutionary step in how the bizarre hands of later Alvarezsaurs evolved from earlier predatory dinosaurs," Choiniere said in a statement.
"The fossil also confirms our predictions that Alvarezsauridae should have been evolving in the Late Jurassic time period."
The fossil of the newly discovered species has several features linking it to Alvarezsauridae, which included species like Mononykus (meaning one claw) and was previously thought to be a flightless offshoot of ancient birds.
But despite the Alvarezsauridae's skeletal similarities to ancient birds, Choiniere's findings showed that the dinosaur family evolved in parallel to birds and was not descended from them.
The Late Jurassic period played a key role in the evolution of birds. Some evidence suggests birds first evolved from theropod (bird-footed) dinosaurs -- the ancestors of predator dinosaurs like T. rex.
The nearly complete Haplocheirus sollers specimen skeleton, which measures ten feet (three meters) long, was collected in 2004 during expeditions to China's remote northwestern Xinjiang region by James Clark of The George Washington University and Xu Xing of the Chinese Academy of Sciences, who co-wrote the study.
"The primary goal of our expeditions was to find evidence of the theropod dinosaurs closest to birds, and the discovery of Haplocheirus is one of our major discoveries," said Clark.
"This spectacular skeleton shows how the strange arms of Mononykus and other Alvarezsaurs evolved from a more typically theropod grasping hand."
The National Science Foundation (NSF) Division of Earth Sciences, the National Geographic Society, the Chinese National Science Foundation and The George Washington University funded the research.
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