宣漢龍屬

宣汉龙属
化石时期：侏羅紀中期, 167.7–161.2 Ma
科学分类 编辑
界： 动物界 Animalia
门： 脊索动物门 Chordata
纲： 蜥形纲 Sauropsida
总目： 恐龍總目 Dinosauria
目： 蜥臀目 Saurischia
亚目： 獸腳亞目 Theropoda
科： †中棘龙科 Metriacanthosauridae
属： †宣汉龙属 Xuanhanosaurus
Dong, 1984
模式種
†七里峽宣漢龍
Xuanhanosaurus qilixiaensis
Dong, 1984

宣漢龍屬（屬名：Xuanhanosaurus）是獸腳亞目恐龍的一屬，生存於侏儸紀中期的中國。

模式種是七里峽宣漢龍（X. qilixiaensis），是由中國古生物學家董枝明在1984年敘述、命名。正模標本（編號IVPP V.6729）發現於中國四川省的下沙溪廟組；下沙溪廟組是大山鋪組的一部分，年代屬於侏羅紀中期[1]。屬名意為「宣漢縣的蜥蜴」，以化石發現處的達州市宣漢縣為名；種名則是以附近的七里峽風景區為名。

宣漢龍的身長約有4.5公尺長，體重約250公斤[2]。宣漢龍的前肢很長，這在獸腳亞目中很不尋常，因為大部份後期獸腳亞目（例如暴龍）的前肢是很短小的。所以宣漢龍被認為是種原始肉食性恐龍。中國古生物學家董枝明命名宣漢龍時，根據宣漢龍的較長、較強壯前肢，仍保有第四掌骨，而推測牠有可能以四足行走[1]。若真如此，牠將是唯一四足行走的肉食性恐龍。不過其他的古生物學家則不認同，因為牠們的前肢結構，無法讓手掌朝下接觸地面，主張宣漢龍仍是以後肢行走，前狀前肢可能用來獵捕動物。

董枝明最初將宣漢龍歸類於斑龍科。在2009年，Roger Benson發現宣漢龍是種基礎斑龍超科動物[3]。

參考資料

  1. ^ 1.0 1.1 Z. Dong. A new theropod dinosaur from the Middle Jurassic of Sichuan Basin. Vertebrata PalAsiatica. 1984, 22 (3): 213–218. 
  2. ^ Paul, G.S., 2010, The Princeton Field Guide to Dinosaurs, Princeton University Press p. 86
  3. ^ Benson R.B.J, 2009. A description of Megalosaurus bucklandii (Dinosauria: Theropoda) from the Bathonian of the UK and the relationships of middle Jurassic theropods. Zoological Journal of the Linnean Society

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