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Xiongguanlong lived in what is now western China between 110 million and 120 million years ago, says Peter Makovicky, a paleontologist at The Field Museum in Chicago.
Science News / Features, Blog Entries, Column Entries, Issues, News Items and Book Reviews 2009
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Xiongguanlong weighed about 270 kilograms and stood about 2 meters tall at the hips.
Science News / Features, Blog Entries, Column Entries, Issues, News Items and Book Reviews 2009
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Other dinosaurs found together with Beishanlong and Xiongguanlong include the beaked and probably herbivorous therizinosauroid theropod Suzhousaurus, primitive relatives of duck-billed dinosaurs, the small horned dinosaur Auroraceratops, and both small and large sickle-clawed theropods.
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According to Mark Norell of the American Museum of Natural History in New York, another member of the team that worked on the two new dinosaurs, "Xiongguanlong sheds light on the missing 40 to 50 million years of tyrannosaur evolution."
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Norell notes that "Xiongguanlong underscores that tyrannosaurs started as small to mid-sized predators, but a number of the traits related to the enormous bite forces of T. rex were already evident at this relatively early stage of tyrannosaur evolution."
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Xiongguanlong would have stood about five feet tall at the hip and weighed close to 600 pounds.
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Adds Makovicky, "The proportions of Xiongguanlong's skull are similar to those of juveniles of large tyrannosaurs, confirming that massive skulls of T. rex and its closest relatives evolved from animlas with long slender snouts like Xiongguanlong."
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Xiongguanlong is unusual among tyrannosaurs in having a very long and narrow snout, rather than a wide, massive skull optimized for powerful biting as is seen in T. rex.
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"Although impressive by today's standards, Xiongguanlong was still a fly weight predator compared to its heavy-weight relatives such as T. rex" says Peter Makovicky, PhD, Curator of Dinosaurs at Chicago's Field Museum, and corresponding author on the study of this animal.
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Xiongguanlong represents a "missing link" in the fossil record of tyrannosaur dinosaurs.
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