A new species of raptor dinosaur being named Linheraptor exquisitus has been discovered by George Washington University doctoral candidate Jonah Choiniere and Michael D. Pittman, a graduate student at University College London (UCL).
The exceptionally well-preserved, nearly complete skeleton is a relative of the well-known species Velociraptor, and will help scientists further describe the physical appearance of other closely-related dinosaurs within the Dromaeosauridae family. The research, led by Xu Xing of the Chinese Academy of Sciences' Institute of Vertebrate Paleontology and Paleoanthropology, will be published in the March 19, 2010, issue of Zootaxa.
"I only saw the tip of the claw sticking out of a cliff face, and it was a total surprise that the whole skeleton was buried deeper in the rock," said Mr. Choiniere. "This fossil is going to tell us a lot about the evolution of the skeleton in the group that includes Velociraptor."
At approximately eight feet long and 50 pounds, the researchers believe Linheraptor would have been a fast, agile predator that preyed on small horned dinosaurs related to Triceratops. Like other dromaeosaurids, it possessed a large, highly curved claw on the foot, which may have been used to capture prey. Within the Dromaeosauridae family, Linheraptor is most closely related to another recently discovered species Tsaagan mangas. The head and neck of the Tsaagan skeleton was discovered in Mongolia in 1993 by James Clark, the Ronald B. Weintraub Professor of Biology at The George Washington University's Columbian College of Arts and Sciences. Tsaagan's skull indicates that it is more primitive than Velociraptor, and the skeleton of the new species should help reconstruct the series of evolutionary changes within the Dromaeosauridae.
"This is a really beautiful fossil and it documents a transitional stage in dromaeosaurid evolution," said Dr. Xu.
Linheraptor was found by the researchers in approximately 75 million year-old red sandstone rocks during a 2008 field expedition in Inner Mongolia, China. It is the fifth dromaeosaurid discovered in these rocks, which are famous for their preservation of uncrushed, complete skeletons. These red sandstones are best known from the Flaming Cliffs field site in outer Mongolia, the location where Velociraptor was discovered and dinosaur eggs and nests were first found.
"The original Tsaagan find was very intriguing, and this discovery should really help us flesh out what these animals looked like," said Dr. Clark.
Dromaeosauridae is a family of bird-like theropod dinosaurs that lived during the Cretaceous Period. In addition to Linheraptor and Velociraptor, theropod dinosaurs include charismatic meat-eaters like Tyrannosaurus rex and modern birds.
This research was funded by the U.S. National Science Foundation and the Chinese National Science Foundation, the Jurassic Foundation, the Geological Society of London and The George Washington University.
Mr. Choiniere is a doctoral student of Dr. Clark's and first accompanied Dr. Clark on his excavations in China in 2005. Though this discovery is Mr. Choiniere's first significant fossil find, he was the lead author of the recent Science article, "A Basal Alvarezsauroid Theropod from the Early Late Jurassic of Xinjiang, China." Mr. Pittman is a doctoral student of Dr. Paul Upchurch and Dr. John R. Hutchinson and has worked with Chinese scientists since 2006.
The article, "A new dromaeosaurid (Dinosauria: Theropoda) from the Upper Cretaceous Wulansuhai Formation of Inner Mongolia, China," appears in the March 19, 2010, issue of Zootaxa. Zootaxa is an international journal for animal taxonomists.
Established in 1821 in the heart of the nation's capital, GW's Columbian College of Arts and Sciences is the largest of the University's academic units with more than 40 departments and programs for undergraduate, graduate and professional studies. Columbian College provides the foundation for GW's commitment to education, research and outreach, providing courses ranging from the traditional disciplines to a wide variety of interdisciplinary and applied fields for students in all the undergraduate degree programs across the University. An internationally recognized faculty and active partnerships with prestigious research institutions place Columbian College at the forefront in advancing policy, enhancing culture and transforming lives through scientific research and discovery.
In the heart of the nation's capital with additional programs in Virginia, The George Washington University was created by an Act of Congress in 1821. Today, GW is the largest institution of higher education in the District of Columbia. The University offers comprehensive programs of undergraduate and graduate liberal arts study, as well as degree programs in medicine, public health, law, engineering, education, business and international affairs. Each year, GW enrolls a diverse population of undergraduate, graduate and professional students from all 50 states, the District of Columbia, and more than 130 countries.
Founded in 1826, UCL was the first English university established after Oxford and Cambridge, the first to admit students regardless of race, class, religion or gender and the first to provide systematic teaching of law, architecture and medicine. UCL is the fourth-ranked university in the 2009 THES-QS World University Rankings. UCL alumni include Marie Stopes, Jonathan Dimbleby, Lord Woolf, Alexander Graham Bell and members of the band Coldplay. UCL currently has over 12,000 undergraduate and 8,000 postgraduate students. Its annual income is over $900 million.
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Emily Cain | EurekAlert!
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