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Chilantaisaurus
''Chilantaisaurus'' ("Ch'i-lan-t'ai lizard") is a genus of neovenatorid theropod dinosaur from the late Cretaceous Ulansuhai Formation of China (Turonian stage, about 92 million years ago). The type species, ''C. tashuikouensis'', was described by Hu in 1964. ''Chilantaisaurus'' was a large theropod, estimated as weighing between and . In 2010, Brusatte ''et al.'' estimated it to weigh , based on femur length measurements.
It was 〔Paul, G.S., 2010, ''The Princeton Field Guide to Dinosaurs, Princeton University Press''.〕 to 〔Holtz, Thomas R. Jr. (2012) ''Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages'', (Winter 2011 Appendix )〕 long.
==Classification==
Hu considered ''Chilantaisaurus'' to be a carnosaur related to ''Allosaurus'',〔Hu, S.-Y. (1964). "Carnosaurian remains from Alashan, Inner Mongolia." ''Vertebrata PalAsiatica'', 8: 42–63. (Chinese, with English summary )〕 though some subsequent studies suggested that it may be a spinosauroid, possibly a primitive member of the spinosaurid family (Sereno, 1998; Chure, 2002; Rauhut, 2001) because it had large claws on the forelimbs thought to be unique to that group. Other studies suggested that it could be a member of an alternate offshoot of neotetanuran theropods, with some similarities to allosauroids, spinosauroids, and coelurosaurians. A 2009 study noted that it was difficult to rule out the possibility that ''Chilantaisaurus'' was the same animal as the carnosaur ''Shaochilong'', which is from the same geological formation. However, they did note an enormous size difference between the two.〔 Further study by Benson, Carrano and Brusatte found that it was not as closely related to ''Shaochilong'' as first thought, but that it was a carnosaur (of the family Neovenatoridae), closely related to ''Allosaurus'' as Hu had initially thought.〔
Several species have been described based on very poor remains. ''Chilantaisaurus? sibiricus'' is based on a single distal metatarsal IV from the Turginskaya Svita of the Buryat Autonomous Soviet Socialist Republic, Russia, dating to the Early Cretaceous (Berriasian-Hauterivian).〔Weishampel, David B; et al. (2004). "Dinosaur distribution (Early Cretaceous, Asia)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 563-570. ISBN 0-520-24209-2.〕〔http://archosaur.us/theropoddatabase/Coelurosauria.htm#Chilantaisaurussibiricus〕 It is poorly described, so its relationships cannot be accurately determined (Chure, 2002). "Chilantaisaurus" ''maortuensis'' was reclassified as ''Shaochilong maortuensis'' in 2009.〔Brusatte, S., Benson, R., Chure, D., Xu, X., Sullivan, C., and Hone, D. (2009). "The first definitive carcharodontosaurid (Dinosauria: Theropoda) from Asia and the delayed ascent of tyrannosaurids." ''Naturwissenschaften'', 〕 Bones attributed to "Chilantaisaurus" ''zheziangensis'' may come from a therizinosaur, and may in fact come from the same individual as the type specimen of ''Nanshiungosaurus''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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