|
''Nanshiungosaurus'' is a genus of therizinosaurian theropod dinosaur from the Cretaceous of China. Two species have been named in the genus: the type species ''Nanshiungosaurus brevispinus'' and ''Nanshiungosaurus bohlini''. ==Discovery and naming== In 1979 ''Nanshiungosaurus brevispinus'' was named and described by Dong Zhiming. The generic name refers to Nanxiong. The specific name is derived from Latin ''brevis'', "short", and ''spina'', "thorn", in reference to the short vertebral spines. The holotype specimen, IVPP V4731, was near Dapingcun in Guangdong found in a layer of the Yuanpu Formation, dating from the Late Cretaceous Campanian. It consists of a partial skeleton lacking the skull but including eleven cervical, ten dorsal and six sacral vertebrae, and a bulky pelvis. It was first thought to be a small, strange sauropod characterised by a shorter but thicker neck than other sauropods.〔Z. Dong, 1979, ''Cretaceous dinosaurs of Hunan, China. Mesozoic and Cenozoic Red Beds of South China: Selected Papers from the "Cretaceous-Tertiary Workshop"'', Institute of Vertebrate Paleontology and Paleoanthropology & Nanjing Institute of Paleontology (eds.), Science Press, Nanxiong, China pp. 342-350〕 In 1997 Dong and You Hailu named and described a second species: ''Nanshiungosaurus bohlini'', based on a skeleton found in 1992 near Mazongshan. The specific name honours the Swedish paleontologist Birger Bohlin. The holotype is IVPP V 11116, from the Early Cretaceous Upper Xinminbao Group dating from the Barremian-Aptian. It consists of only eleven cervical and five dorsal vertebrae with some ribs.〔Dong Z. and Yu H., 1997, "A new segnosaur from Mazongshan Area, Gansu Province, China", In: Dong (ed). ''Sino-Japanese Silk Road Dinosaur Expedition''. China Ocean Press, Beijing. pp. 90-95〕 Dong and You presented no evidence or argumentation supporting the assignment of the species to ''Nanshiungosaurus''. In view of the lack of synapomorphies, shared unique traits, and the large age difference with ''Nanshiungosaurus brevispinus'' it is generally considered that the second species might warrant its own genus.〔〔Paul, G.S., 2010, ''The Princeton Field Guide to Dinosaurs'', Princeton University Press p. 158〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nanshiungosaurus」の詳細全文を読む スポンサード リンク
|