完美中国颌兽(Sinognathus gracilis)头骨化石标本的新观察  

NEW OBSERVATIONS ON THE SKULL OF SINOGNATHUS GRACILIS (CYNODONTIA, REPTILIA) ASSISTING WITH CT SCAN TECHNIQUE

作　　者：张法奎[1] 杜湘珂[2] 朱奇志[2] 程希侃[2] 

机构地区：[1]中国科学院古脊椎动物与古人类研究所,北京100044 [2]北京医科大学人民医院放射科,北京100044

出　　处：《古脊椎动物学报》1999年第4期267-277,339-341,共11页Vertebrata Palasiatica

基　　金：国家自然科学基金!49672081

摘　　要：通过ＣＴ扫描对完美中国颌兽（犬齿兽科，爬行纲）头骨正型标本进行再研究，实现了无损伤观察化石标本内部结构之目的，发现脑颅内腔的上方有特别长大的三棱柱形的构造，暂解释为额－顶窦。对鳞骨后外侧面的外耳道作了详细观察记述。The type specimen of Sinogathus gracilis is restudied. Some characters which former workers were not noted are replenished. Among the new discoveries the external auditory meatus interlinked with the cavity of middle ear by an opening at the bottoms of external auditory meatus, and the side wall of braincase encircled completely by the laminae of bone are interesting to paleontologists and evolutionary biologists. The result of CT scanning the type specimen of S. gracilis is satisfactory for us as follows: 1) An exotic in the stuff in cavity of olfaction is found. 2) A trigonal region in the upper part on the corona section of the braincase, a struture unknown before, is tried to explained as the frontoparietal sinusis.

关 键 词：中国颌兽 头骨化石标本 CT扫描 

分 类 号：Q915.864[天文地球—古生物学与地层学]