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古脊椎动物学报 ›› 2003, Vol. 41 ›› Issue (03): 195-202.

• 古脊椎动物学报 • 上一篇    下一篇

辽宁西部早白垩世义县组一新的手盗龙类

徐 星, 汪筱林   

  • 出版日期:2003-09-15 发布日期:2003-09-15

A NEW MANIRAPTORAN DINOSAUR FROM THE EARLY CRETACEOUS YIXIAN FORMATION OF WESTERN LIAONING

XU Xing, WANG XiaoLin   

  • Published:2003-09-15 Online:2003-09-15

摘要: 我国辽西早白垩世热河群义县组和九佛堂组近年来产出大量恐龙化石,已知兽脚类恐龙包括8 属10 种,其中6 属8 种保存有原始羽毛或者羽毛结构。已经报道的属种均产自朝阳地区。2001 年,中国科学院古脊椎动物与古人类研究所辽西野外考察队在邻近朝阳的锦州地区义县头台乡王家沟义县组下部采集到一件恐龙标本。这一标本保存了较为完整的肩带和前肢,在骨骼化石附近还保存了皮肤结构。通过研究对比,我们建立了手盗龙类的一个新属种:长掌义县龙(Yixianosaurus longimanus gen. et sp. nov. )

Abstract: A specimen collected from the Early Cretaceous Yixian Formation, Jehol Group of Liaoning, China, represents a new genus and species of maniraptoran theropod. It comprises almost complete articulated pectoral girdles, forelimbs and some ribs and is here named Yixianosaurus longimanus gen. et sp. nov. Diagnostic features of the new species include manus 140 % as long as humerus, manual phalanx Ⅱ-2 longer than metacarpal Ⅱ, manual phalanx Ⅲ-3 244 % as long as phalanx Ⅲ-1, and manual phalanx Ⅲ-2 bearing a proximoventral heel. With the integuments preserved on the holotype specimen, Y. longimanus represents the ninth feathered dinosaur species reported from western Liaoning. The elongated penultimate phalanges of Y. longimanus indicate an improved grasping capability and might represent an adaptation to the arboreal habit. The discovery of Y. longimanus increases the diversity of theropod dinosaurs in the Jehol Fauna.