EXPANDED VERSION DODSON ON DINOSAURS China Reaches the Top By Peter Dodson Nonetheless, I find the material enumerated above a pretty compelling reason for making the grueling trek to China every summer as I have since 2004. To the casual observer of paleontology, I will wager that the taxa named above are pretty unfamiliar. I did not learn any of these names as a child, when I was thrilled by Tyrannosaurus rex, Diplodocus, and Triceratops. Neither did my children nor many other children on the planet except perhaps for a privileged few in China. Except for Archaeoceratops, christened way back in the previous century, all of 12 years ago (1997), these dinosaurs were all named since 2005. Xiongguanlong and its mate Beishanlong (Makovicky et al., 2009) were named in April 2009. The latest dinosaur of which I am aware at this writing is Qiaowanlong You & Li, on Sepember 4, 2009; and before that, Limusaurus Xu et al., 2009, was published in the British journal Nature on June 17, 2009. The pulse of discovery of dinosaurs in China has been little short of astonishing. I have an announcement to make. If I were a blogger, a Facebooker, or Twitterer (and I have certainly been called a twit more than once in my life!), perhaps I would have chosen an electronic venue for doing so. But when it comes to communication, I am a Neanderthal, a remnant of the last Ice Age; I have too much respect for the printed word. Thus you, dear reader, are the first to learn in print that China has now passed the United States to achieve the rank as the world’s greatest country for dinosaurs. I made this discovery while preparing a talk in June to celebrate the 30th anniversary of the Delaware Valley Paleo Society, which was founded in 1978. (Like all amateur organizations, things proceed at their own pace). I have made a habit of tracking the accumulation of dinosaur genera over the years. The first dinosaur, Megalosaurus, was described in 1824; the latest (for about 15 minutes), Limusaurus, was in June of this year. I must explain that I am skeptical about the validity of dinosaur species, even though we are required by the rules of zoologiMap showing the geography and principal dinosaur localities of China. Courtesy of You Hailu. cal nomenclature to name them. In As I write these words I am sitting at a table in the Fossil Research and Development Center of the Third Geology and Mineral Resources Academy of the Gansu Provincial Bureau of Geo-Exploration and Mineral Development in Lanzhou. To my right, eclipsed by my computer screen, is the skull of the newly described tyrannosauroid Xiongguanlong grandis described by my friend Li Daqing, and a team of American and Chinese researchers (Li et al., 2009). Also sharing the table are casts of Auroraceratops rugosus, Archaeoceratops oshimai, and three recently collected skulls of a basal neoceratopsian still awaiting taxonomic labels. At my left, beyond my diligent graduate student Eric Morschhauser, are a plethora of fossils dominated by a reconstruction of the skull of the great iguanodontian Lanzhousaurus magnidens. In front of me is a panel of sauropod footprints of astonishing size. The footprint measures 1.2 meters front to back and a full meter across. The adjacent handprint measures 80 centimeters across. I did not come to north-central China to view the total eclipse of the sun on July 22, although I was excited by the 90% eclipse that we witnessed. AMERICAN PALEONTOLOGIST 17(4) Winter 2009 online supplement the historical past, species were named promiscuously and names multiplied unreasonably. The genus tends to be a more stable taxonomic unit, and pragmatically, I prefer that level of analysis. Most dinosaur genera have only one species per genus, although a few, most especially Psittacosaurus, seem highly speciose. Another personal idiosyncrasy is that when I talk about dinosaurs, I mean DINOSAURS, not birds. Most of my colleagues accept that birds are dinosaurs, and I tend to be just a little behind the curve on holding out. By my count, in 1970, there were 160 genera of dinosaurs; in 1990, there were 285 genera (Dodson, 1990), in 2006, 527 genera (Wang & Dodson, 2006), and in June 2009, 620 genera. Obviously the number has grown by leaps Li Daqing, Peter Dodson, and You Hailu at the Liujiaxia National Dinosaur Footprint Geopark, and bounds in recent years and is truly Yong Jing County, Gansu, China. You and Li have described the majority of Gansu’s dinosaurs. Photo a moving target. The other thing that courtesy of You Hailu. I have kept track of is which countries are the richest in dinosaurs. In 1990, the United States was number one with 64 genera, a position pod excavated in Shandong Province in 1923 by the Austrian it had maintained since the 1870s when dinosaurs were dispaleontologist Otto Zdansky and Chinese geologist Tan Xicovered in abundance in the American West. Mongolia was Chou, and a hadrosaur from the same region. The skeletons number 2 (40 genera), followed by China (36), Canada (31), were shipped to Sweden, where they were described as HeloEngland (26), and Argentina (23). These six countries acpus (now Euhelopus) and Tanius, respectively, by Carl Wiman count for about 75% of the world’s dinosaurs. In my lectures in 1929. Fortunately, Chinese science was not far behind, in for years, I had maintained that the United States had an the person of C. C. Young (now known by his Chinese name insurmountable lead in the dinosaur race. When I counted of Yang Zhongjian, 1897-1979). Educated in Germany, again in 2006 (Wang & Dodson, 2006), the results were reYang described his first dinosaurs in 1932, several species of vealing. The United States was still in the lead but only by a Psittacosaurus, and thereafter conducted excavations in Yunnarrow margin: USA 108 genera to China 101 genera. Morenan, Sichuan, Shandong, Xinjiang, and Gansu. He was the over, although the American total had increased by a healthy founder and first director of the Institute of Vertebrate Paleamount, 69% since 1990, China had truly undergone a great ontology and Paleoanthropology in Beijing, known to paleleap forward – a 180% increase since 1990! Several years earontologists around the world as the IVPP. His legacy includes lier, I had recognized the inevitable, and predicted that China such important dinosaurs as Lufengosaurus, Yunnanosaurus, would overtake the U.S. perhaps within the next decade or Mamenchisaurus, Omeisaurus, and Tsintaosaurus. He trained two. In the same tally, Argentina (61 genera) had leapt from many paleontologists, most importantly Zhao Xijin (Chao sixth place to third place with a 165% increase. Mongolia Shichin) and Dong Zhiming, who kept Young’s legacy of di(58 genera) had fallen to fourth with a 45% increase. When I nosaur paleontology alive after Young’s death in 1979. Dong checked again recently, I discovered that 92 genera had been has collected and described many dinosaurs during his career, described in four years. Of these, 31 genera were from China, and ranks among the most prolific describers in the history 15 from Argentina, and only 10 from the United States. Thus of dinosaur paleontology; his only peers are O. C. Marsh and as of June 2009, the count of dinosaurs stood at China 132 Jose Bonaparte, and also Xu Xing. Among Dong’s 20 genera genera and the U.S. 118 genera. The crossover actually ocof dinosaurs are Archaeoceratops, Huayangosaurus, Shunosaucurred in 2007. Well done, China! rus, and Tuojiangosaurus. How did this come to be? The 1920s were a turbulent An important development in the history of Chinese ditime in Chinese history, and the People’s Republic of China nosaur paleontology was the Canada-China Dinosaur Projdid not yet exist. The era of dinosaur paleontology in China ect (CCDP) from 1986 to 1990. The agreement for a largedawned more quietly than in Mongolia. The first Chinese scale international cooperative joint venture was signed by dinosaurs that are still recognized as valid include a saurothe IVPP, the Canadian Museum of Nature in Ottawa, and AMERICAN PALEONTOLOGIST 17(4) Winter 2009 online supplement unleashed a flood of exciting and spectacular fossils of small theropod dinosaurs, protobirds, and true birds, many of which had had genuine feathers, plumes, and other soft-tissue embellishments. Although most of the feathered fossils are theropods, one specimen of Psittacosaurus has elaborate showy plumes of some sort. Most of the fossils come from the Lower Cretaceous Jehol Group in western Liaoning (Liaoxi), especially from the Yixian and the Jiufotang Formations dated between 126 and 120 million years BP. The Jehol biota represents true lagerstätten deposited in finely laminated layers in lakes periodically choked with volcanic ash. The fossils are preserved in exquisite detail, often showing soft structures and integument. They include insects, crustaceans, fishes, amphibians, various reptiles, birds, mammals, and above all small dinosaurs, one of which, Microraptor, is a spectacular little feathered and toothed dromaeosaurid; Sinornithosaurus is another. Another salutary aspect of Chinese paleontology is that young scientists are leading the way. Xu Xing at the IVPP described his first two dinosaurs (Sinornithosaurus and Beipiaosaurus) in 1999, and since then, has described more new genera of dinosaurs, 23 so far, than anyone who as ever lived! Several of his spectacular ones include Guanlong and Meilong. Xu did his Ph.D. in China, and added postdoctoral experience at the American Museum of Natural History. He is now training new Chinese scientists. You Hailu and Lü Junchang both did their Ph.D.s in the United States, at the University of Pennsylvania and Southern Methodist University, respectively. Each returned to China to a position at the Institute of Geology, Chinese Academy of Geological Sciences in Beijing. Each has already described 10 new dinosaurs. Gao Keqin did his Ph.D. at the University of Alberta with Richard Fox. After a number of years at the American Museum of Natural History, he has returned to Beijing to establish an active paleontology program at prestigious Peking University, China’s top-ranked university. Three flourishing dinosaur research programs exist in Beijing where there was once was only one. A number of western paleontologists collaborate with Chinese scientists, myself included. Other westerners have become persona non grata. What is the difference? It requires some sensitivity to work with our Chinese colleagues. If you are an insensitive jerk in the United States, A banquet in Beijing with two of China's most important senior paleontologists. Dong Zhiming (left) don’t bother coming to China. It has collected and described more dinosaurs than almost any other paleontologist who has ever lived. will not be a happy experience. The Ji Qiang (right) described Sinosauropteryx, the protofeathered coelurosaur that sparked a scientific Chinese do not need us to work with them. They are doing extremely well revolution. the Royal Tyrrell Museum of Palaeontology in Drumheller, Alberta, and led to large Chinese-Canadian expeditions to Xinjiang and Inner Mongolia, as well as to Alberta and the Canadian Arctic. Many important new dinosaurs resulted, including Monolophosaurus, Sinraptor, Sinornithoides, and Alxasaurus. Other joint ventures with Japan and Belgium in the 1990s brought important new finds as well. I attended the Sixth Meeting of Mesozoic Terrestrial Ecosystems at the IVPP in Beijing in 1995. This meeting was pivotal in my career, although I did not know it at the time. I also did not know that China, the sleeping giant of dinosaur paleontology, was about to awaken on the world stage. I was pleased to visit museums to see the legacy of the work of Yang and Dong, and tour fossil sites in Sichuan, Yunnan, and Xinjiang. I also made one shrewd move. I invited You Hailu to come to the University of Pennsylvania and do a Ph.D. with me. He completed his Ph.D. in 2002 and returned to China, to the Institute of Geology of the Chinese Academy of Geological Sciences (CAGS). He has been highly productive, and in 2003 accomplished a feat that no one had ever done before – he described five genera of dinosaurs in one year. Two stemmed from his thesis (Equijubus and Gobititan) but the other three (Hongshanosaurus, Shuangmiaosaurus, and Magnirostris) were not. My students and I have worked intensively with Hailu in China since 2004. The extraordinary fossils of northeastern China came to western attention in 1996, with the publication of Sinosauropteryx prima, a small coelurosaur covered with a featherlike integument. Whether the covering actually consists of protofeathers or not is irrelevant in a way, because the find AMERICAN PALEONTOLOGIST 17(4) Winter 2009 online supplement on their own. There are unwritten rules of behavior, many of which simply boil down to good manners. Would-be collaborations typically fail for reasons other than scientific ones. It requires patience and the building of relationships. It will require many meals shared together. Don’t be insistent on eating western food; that will win few friends. I have consumed vast quantities of cha (tea) and pijiu (beer) and quite limited quantities of baijiu (highly alcoholic clear white distilled spirits of sorghum). One can feel pressured to consume more alcohol than one prefers. Each social situation has to be evaluated on its own. I have generally prospered on several accounts. As an elder statesman, the Chinese culture is predisposed to treating me with deference. And because You Hailu, my nearly constant companion in China, does not drink alcohol himself, I also enjoy the umbrella of his protection. One does not buy respect from colleagues by drunkenness, but neither does locking oneself in one’s room and avoiding social contact. As one receives hospitality, so one must also invite one’s colleagues to dine. It is understood that fossils collected in China stay in China, although your host might give you study casts to bring home. Good photographic technique is essential! Very typically papers published on Chinese material have the Chinese colleague as first author. This can be difficult to accept but I believe it is the key to long-term and mutually beneficial relationships. When a trusting relationship is established, exceptions can occur with mutual consent and understanding. And be gracious! Even now as I prepare remarks for the opening of a dinosaur exhibition, my host has prompted me to make sure to include you-know-who and you-know-who in my remarks, so that nobody important feels slighted. Observing these protocols is so important for harmonious outcomes. After several visits to China, Hailu pointed out that it was time for me to learn Chinese, so I took a course along with my Japanese student, Kyo Tanoue, who of course ran circles around me. My Chinese is poor and severely limited but the effort is there and I try to build on it every year, and this is appreciated. My deep friendship and productive collaboration with You Hailu has resulted in further relationship with Li Daqing in Lanzhou, Gansu Province. Li is a wonderful collector, has established a dinosaur research unit within the governmental structure in Gansu, and has organized a tremendously productive crew of field paleontologists. Li and his staff have literally put Gansu on the paleontological map in the past 10 years. But more than that, we have become close friends, almost like brothers. His lovely daughter, Li Zhen, who loves to speak English with me, is like my niece. His lively and entertaining wife, Guo Lei, a professor of rhythmic gymnastics, has invited me as a guest in her home, a rare and cherished privilege for me. In reciprocation, Daqing spent three months in my lab as my guest, where he completed his Ph.D. dissertation. He attended my daughter’s wedding and experienced an American Thanksgiving with my family (as had Hailu and Kyo in their times). Our relationship is AMERICAN PALEONTOLOGIST 17(4) Winter 2009 online supplement equally professional, personal, and long lasting. And this is how to do business in China. I now wish to discourse a bit on Chinese dinosaur geography, which is a very daunting subject that has taken me years to make headway with, as much as I love staring at maps of the country. I believe it is incumbent on all dinosaur paleontologists to know something of this subject. Perhaps my few comments might help someone. Political geography is not simple. China has 23 provinces (including Taiwan), five autonomous regions, and four municipal regions, including Beijing. Chinese dinosaurs are broadly distributed through the huge country. Try to fix in mind the location of Beijing, in northeastern China 150 km inland from the Bohai Sea. Beijing is surrounded by the province of Hebei. China’s first taxonomically diagnostic dinosaur, Euhelopus (Helopus) came from Shandong Province, southeast of Beijing. This coastal province stretches out into the Yellow Sea, which is made yellow from the silt of the Yellow River (Huang He). Other famous dinosaurs of Shandong include Tsintaosaurus, Shantungosaurus, and Psittacosaurus sinensis. Yang Zhongjian made important discoveries of Early Jurassic prosauropods (Lufengosaurus and Yunnanosaurus) in the city of Lufeng in Yunnan Province in the southwestern corner of China. Mountainous plant-rich Yunnan borders Myanmar (Burma), Laos, and Vietnam. Dong Zhiming has recently established a remarkable fossil park (World Dinosaur Valley) at Lufeng that includes both serious science and family entertainment. To the north of Yunnan is the province of Sichuan, famous for its spicy cooking. It also hosts a very important fauna of Middle and Late Jurassic sauropods and stegosaurs, including Omeisaurus, Mamenchisaurus, Shunosaurus, Huayangosaurus, and Tuojiangosaurus. In the 1970s, dinosaurs were discovered at Zigong and through the efforts of Dong Zhiming, the spectacular Zigong Dinosaur Museum was established, featuring a display of one hundred skeletons in situ on a vast bedding plane. For decades, the dinosaurs of Sichuan plus those of Shandong constituted the iconic symbols of Chinese dinosaurs. Huge Xinjiang Autonomous Region in northwestern China is dominated by the tall Tian Shan Mountains that separate the Junggar Basin and the Gobi Desert in the north from the Turpan Basin and the vast sandy Taklamakan Desert to the south. Xinjiang shares borders with Mongolia, Tibet, the former Soviet Republics, and Pakistan. A young Yang Zhongjian worked in the Junggar Basin in 1928 with the Sino-Swedish expedition led by Sven Hedin and later in 1937, he described the Late Jurassic sauropod Tienshanosaurus from the Shishugou Fm. For the China-Canada Dinosaur Project (CCDP) of 1986-1990, the Junggar Basin was a major focus, and several treasures were recovered, including the theropods Monolophosaurus and Sinraptor as well as a gigantic long-necked Mamenchisaurus sinocanadorum. Since 2001, James Clark of George Washington University has teamed up with Xu Xing of the IVPP to work in the Junggar Basin, and their haul of early Late Jurassic dinosaurs includes Guanlong (a crested very early predecessor of Tyrannosaurus), Yinlong (a likewise very early ancestor of horned dinosaurs), and most recently, as of June 17, 2009, Limusaurus, a toothless theropod whose hands prefigure the condition in birds. The next province to the east of Xinjiang is Gansu, still in the northwest. Gansu is long and thin, and runs 1,200 kilometers from Mongolia in the northwest to Sichuan in the southeast. Its two longest borders are with Qinghai along the southwest, punctuated by the Qilianshan Mountains, and with Inner Mongolia on the northeast. The Sino-Swedish expeditions collected fragmentary fossil material near Jiayuguan in 1930 that was described by Birger Bohlin in 1953 (e.g., Heishansaurus), but the first important fossil descriptions of dinosaurs were the result of the Sino-Japanese Silk Road Dinosaur Expeditions of 1992 and 1993 that led to the description of Archaeoceratops Dong & Azuma, 1997, and a number of other small and fragmentary dinosaurs from the Early Cretaceous of the Mazongshan region on the southern edge of the Gobi Desert near the Mongolian border. You Hailu did his Ph.D. research in the Mazongshan area and described the sauropod Gobititan and the hadrosauroid Equijubus in 2003. Li Daqing established an extremely important research program at the Fossil Research Center in Lanzhou, the capital of Gansu, located on the Yellow River in the southeastern region of Gansu. He discovered impressive Early Cretaceous dinosaurs in the Lanzhou Basin, an hour’s drive from his office. Li entered into a productive partnership with You Hailu, and also with me and my students. Important dinosaurs recovered by Li and his team include the heavy iguanodont Lanzhousaurus (2005), and the sauropods Huanghetitan (2006) and Daxiatitan (2008), the latter China’s largest sauropod at 27 meters in length. Li also discovered an enormous area of dinosaur trackways, including the prints described above in Yong Jing County. This scenic area beside the Huang He (Yellow River) is now preserved as Liujiaxia National Dinosaur Geopark, which is easily reachable only by boat or by train. Meanwhile, back in the Gobi, Li’s dinosaurs include Auroraceratops (2005), the towering therizinosaur Suzhousaurus (2007), and this spring two marquee theropods, the very large ornithomimosaur Beishanlong and the tyrannosauroid Xiongguanlong. The very latest is the first Chinese brachiosaurid Qiaowanlong. Gansu is “hot!” Nei Mongol Autonomous Region (also known as Inner Mongolia) is an enormous expanse stretching nearly 2,500 kilometers across north-central and northeastern China from Gansu to Heilongjiang at the northeastern extreme of China. It underlies the eastern two-thirds of Mongolia and reaches Siberia. Dinosaurs were discovered near Iren Dabusu in 1923 by the Central Asiatic Expeditions of the American Museum of Natural History, and were described by Charles Gilmore in 1933. We now know these dinosaurs as Archaeornithomimus, Alectrosaurus, Gilmoreosaurus, and Bactrosaurus. Over the years, subsequent expeditions have had continuing success in either late Early Cretaceous or early Late Cretaceous sediments. Especially noteworthy were the efforts of the CCDP, which resulted in the description of the primitive therizinosaur Alxasaurus from the Alxa Desert, and the troodontid Sinornithoides from the Ordos Desert. The most productive locality, Bayan Mandahu, yielded an abundance of Protoceratops and Pinacosaurus skeletons. In 2003, 14 skeletons of an ornithomimid were given the name Sinornithomimus, and in 2007, a gigantic oviraptorosaur, Gigantoraptor, was published. Inner Mongolia can be expected to continue producing interesting fossils for many years to come Geographically, we now have come a full circle back to the Sea of Bohai and Korea Bay on China’s eastern coast. Liaoning is a relatively small province only 500 kilometers northeast of Beijing, an easy drive on modern expressways. It is sandwiched between Inner Mongolia on the west, North Korea on the east, Jilin to the northeast, and Hebei to the southwest. The names of some of its cities and villages strike a chord with dinosaur cognoscenti: Jinzhou (Jinzhousaurus), Beipiao (Beipiaosaurus), Chaoyang (Chaoyangsaurus), and Lujiatun (Psittacosaurus lujiatunensis). It is the astonishing and prolific fossil treasures of Liaoning that have pushed China to the fore in dinosaur and avian paleontology. It is impossible to say too much about them, and visitors to any major museum in China will enjoy the fruits of these discoveries, most recently the extraordinary “protofeathered” heterodontosaurid Tianyulong, described in March of this year (Zheng et al., 2009). The two northeastern provinces are Jilin and Heilongjiang. Both have produced dinosaurs in recent years. Two hadrosaurs have been named from Heilongjiang, which is both the name of the province and the name of the river dividing Far Eastern Russia from China. The Chinese name means “black dragon river” but it is more familiar to us as the Amur River. It was here in 1902 that Russians found bones that were carried back to Moscow, where they were described in 1925 as Trachodon amurense (renamed Mandschurosaurus amurensis in 1930), technically China’s first dinosaur but not one now regarded as valid. Belgian paleontologist Pascal Godefroit and Chinese colleagues have described several Late Cretaceous hadrosaurs from the banks of the Amur River, both in China (Charonosaurus and Sahaliyania) and with Russian colleagues in Russia (Olorititan). Lü Junchang works in several provinces in eastern China from Guandong in the extreme southeast to Henan, which is adjacent to Shandong. He is finding important fossils, such as the oviraptorid Heyuannia from Guandong to the dromaeosaurid Luanchuanraptor in Henan. Thousands of dinosaur eggs have been found in Henan and Hubei, and others have been found in considerable numbers in Guandong and Inner Mongolia. In fact, China was famous for its dinosaur eggs in the 1990s prior to the discovery of feathered theropods and birds. The Chinese language is nothing if not daunting for us Westerners. Learning a few rudiments can make our task as AMERICAN PALEONTOLOGIST 17(4) Winter 2009 online supplement paleontologists easier. I want to introduce a smattering of Chinese. Trust me, the future speaks Chinese! Many Chinese dinosaurs carry familiar-sounding Greek and Latin names, and are not too intimidating. How hard is Microraptor? Others carry obvious geographic names such as Beipiaosaurus or Liaoceratops. But names with Chinese roots are increasingly used today. Let us start with the word for dinosaur, konglong. Kong is terrible. Long is dragon. The root long appears commonly in Chinese dinosaur names, much as does the suffix saurus. Guanlong, Meilong, Xiongguanlong, etc. Shan refers to mountain, he and jiang both refer to rivers. Directional terms are bei, north, and nan, south: so Beijing is North Capitol, and Nanjing is South Capitol. East is dong, west is xi. Thus the province of Shandong is “east of the mountains” and Shanxi is “west of the mountains.” See the logic? The province of Hebei is north of a river (the Yellow River), and Henan is south of the Yellow River. Another pair of northsouth provinces are Hubei and Hunan, in the south. Another pair of east-west provinces in the south are Guandong and Guanxi. There is also Dongbeisaurus, the “northeast reptile.” Let us try some colors: bai is white, hei is black, hong is red, and huang is yellow. Huanghe is the Yellow River. Huangehetitan is the “Yellow River titan,” obviously a titanosaur. Heishansaurus is the “Black Mountain reptile,” a fragmentary ornithischian skull. Heilongjiang is the “Black Dragon River,” better known as the Amur River. Hongshanosaurus is the “red mountain reptile,” named after the Red Mountain culture in Chinese archaeology, rather than after a specific mountain. Da means large, xiao means small, but it also means dawn. Xiaosaurus, a small ornithopod, is actually “the dawn reptile.” So far, I have not found a name using da. Daxiatitan actually uses the root daxia, which denotes an ancient culture in Gansu. Some roots are obvious – sino meaning Chinese. Sinornithoides is “Chinese bird-like animal.” Sinraptor is the “Chinese raptor” or thief. This ends our Chinese lesson for the day. Two sources summarizing the dinosaurs of China are Currie (1997) and Li et al. (2008), neither of which is highly accessible to Western readers. There are superb illustrated volumes on the Jehol biota of Liaoning, but these are published in China and so are also not readily accessible. Who knows, if I keep coming to China for long enough, maybe I will write the book myself! AMERICAN PALEONTOLOGIST 17(4) Winter 2009 online supplement References Currie, P. J. 1997. Chinese dinosaurs. Paleontological Society of Korea, Special Publications, 2: 93-101. Dodson, P. 1990. Counting dinosaurs: how many kinds were there? Proceedings of the National Academy of Sciences, 87: 7608-7612. Li, D., M. A. Norell, K.-Q. Gao, N. D. Smith, & P. J. Makovicky. 2009. A longirostrine tyrannosauroid from the Early Cretaceous of China. Proceedings of the Royal Society B: published online 22 April 2009, doi:10.1098/rspb.2009.0249. Li, J, X. Wu, & F. Zhang, eds. 2008. The Chinese Fossil Reptiles and Their Kin, 2nd ed. Science Press, Beijing, 473 pp. Makovicky, P. J., D. Li, K.-Q. Gao, M. Lewin, G. M. Erickson, & M. A. Norell. 2009. A giant ornithomimosaur from the Early Cretaceous of China. Proceedings of the Royal Society B: published online 22 April 2009, doi:10.1098/rspb.2009.0236. Xu, X., J. M. Clark, J. Mo, J. Choiniere, C. A. Forster, G. M. Erickson, D. W. E. Hone, C. Sullivan, D. A. Eberth, S. Nesbitt, Q. Zhao, R. Hernandez, C.-K. Jia, F.-L. Han, & Y. Guo. 2009. A Jurassic ceratosaur from China helps clarify avian digital homologies. Nature, 459: 940-944. You, H.-L., & D.-Q. Li. 2009. The first well-preserved Early Cretaceous brachiosaurid dinosaur in China. Proceedings of the Royal Society, 276B: 4077-4082. Wang, S. C., & P. Dodson. 2006. Estimating the diversity of dinosaurs. Proceedings of the National Academy of Sciences, 103: 13601-13605. Zheng, X.-T., H.-L. You, X. Xu, & Z.-M. Dong. 2009. An Early Cretaceous heterodontosaurid dinosaur with filamentous integumentary structures. Nature, 458: 333-336. Peter Dodson is Professor of Anatomy in the School of Veterinary Medicine and Professor of Earth and Environmental Science in the School of Arts and Sciences at the University of Pennsylvania. His column is a regular feature of American Paleontologist. Email [email protected]. Dr. You Hailu, featured prominently in this article, offers a series of geotours in China through the Sinofossa Institute. See his upcoming tours at http://www.sinofossa.org.
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