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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 1 0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。 2 0 0 1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 (Yixianosauruslongimanusgen .etsp .nov .)。依据以下特征将长掌义县龙归入手盗龙类 :肩胛骨明显短于肱骨、肩臼窝的乌喙骨部分小、乌喙骨近四方形、尺骨向后弯曲以及挠骨细。长掌义县龙手部的相对长度以及手指各指节的相对比例不同于已知手盗龙类。原始兽脚类恐龙的手部一般短于肱骨 ;手盗龙手部加长 ,长于肱骨 ;原始鸟类的手部相对更长 ,但进步鸟类出现反转 ,手部次生变短。长掌义县龙手部的相对长度在非鸟兽脚类恐龙当中仅比原始祖鸟 (Protarchaeopteryx) (Jietal.,1 998)和树息龙 (Epidendrosaurus) (Zhangetal.,2 0 0 2 )短。次末端指节加长是兽脚类恐龙的一个进步特征 ,长掌义县龙具有这一特征。比如 ,长掌义县龙的手指指节Ⅱ 2长于掌骨Ⅱ ,在已知兽?
In recent years, a large number of dinosaur fossils have been produced in Yixian Formation and Jiufotang Formation of Early Cretaceous Rehehe Formation in western Liaoning Province. There are 10 genera and 8 genera in 10 genera, including 6 genera and 6 feathers preserved in their original feathers or feathers. Already reported species are produced from the Chaoyang area. In 2001, a field investigation team of the Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences collected a specimen of dinosaur in the lower part of the Yixian Formation of Wangjiagou County, Tiantai Township, Tiantai, Yi County, near the Chaoyang district. This specimen preserved the more complete shoulder straps and forelimbs and preserved the skin structure near the fossilized bone. Through research and comparison, we have established a new genus of the genus Piranha: Yixianosaurus longimanusgen. Ép. Nov. According to the following characteristics of the Longzheng Yixian Dragon into the category of hand Pirates of the Dragon: Scapula was significantly shorter than the humerus, acetabulum of the small coracoid part of the beak, the beak coraco nearly square, the ulna backward bending and bending bone fine. The relative length of the long hand of Longzhangyi County and the relative proportions of finger knuckles are different from the known hand-handed dragon. The hands of the primitive animal-footed dinosaurs are generally shorter than those of the humerus; the hands of the hand-tyrannosaurus are lengthened longer than the humerus; the hands of the primitive birds are relatively longer, but the progressive birds appear reversed and their hands secondary shorter. The relative length of the long hand of Longzhangyi County is only shorter than that of the Protarchaeopteryx (Jietal., 1998) and Epidendrosaurus (Zhangetal., 2002) among non-beast-footed dinosaurs. The secondary end of the knuckle extension is a progressive feature of theropod dinosaurs, Longzhangyi County dragon has this feature. For example, Longzhangyi County dragon’s finger knuckle Ⅱ 2 longer than the metacarpal Ⅱ, known beast?