中国辽西早白垩世义县组始无齿翼龙新材料  

New material of the pterosaur Eopteranodon from the Early Cretaceous Yixian Formation, western Liaoning, China

作　　者：吕君昌[1] 高春玲 刘金远 孟庆金 季强[1] 

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]大连自然博物馆,辽宁大连116023

出　　处：《地质通报》2006年第5期565-571,共7页Geological Bulletin of China

基　　金：This study is supported by the National Key Basic Research and Development Program (Grant 2006 CB 701405) and the China Geological Survey, Grant 200413000024 to Ji Qiang.

摘　　要：根据新材料,对始无齿翼龙的特征进行了修订:中部颈椎体没有神经棘;肱骨三角嵴的长度与肱骨长度之比率约为0．25; 翼掌骨的长度与第二翼指骨的长度几乎相等;第二翼指骨与第一翼指骨的长度之比率约为0．76。始无齿翼龙的新标本与正型稍微不同,可能由个体发育所引起。The diagnostic features of Eopteranodon are amended on the basis of new material. The amended features are as follows： the neural spines in the mid cervical vertebrae are absent; the ratio of the length of the deltopectoral crest to the humerus length is approximately 0.25; and the length of the metacarpal Ⅳ is almost equal to the length of the second wing phalange; the ratio of the length of wing phalange 2 to wing phalange 1 is approximately 0.76. The new specimen of Eopteranodon is slightly different from its holotype, probably due to ontogenetic development.

关 键 词：辽宁北票地区 义县组 早白垩世 始无齿翼龙 无齿翼龙科 

分 类 号：Q915.86[天文地球—古生物学与地层学]