内蒙古乌兰塔塔尔地区早渐新世梳趾鼠类头骨新材料

徐冉成, 李茜

New skulls of ctenodactyloids from the Early Oligocene of Ulantatal, Nei Mongol, China

XU Ran-Cheng, LI Qian

Fig. 6 3D-reconstruction and some CT images of partial structures of the left middle ear of Bounomys ulantatalensis (IVPP V 26127) from the Ulantatal Formation of Ulantatal area, Alxa Left Banner, Nei Mongol The yellow model in the center of the picture is the ventral view of the middle ear cavity (some structures that obstruct the observation have been removed) and is surrounded by CT images of different parts of the middle ear cavity. A-A’. the transverse plane through the opening of the auditory tube; B-B’. the transverse plane through the anteromedial shelf; C-C’. the transverse plane through the promontorium; D-D’. the sagittal plane through the promontorium Abbreviations: ad. anterior depression 前凹; ams. anteromedial shelf 前内侧架; aub. auditory bulla 听泡; aut. auditory tube 咽鼓管; coc. cochlear canal 蜗管; eac. external acoustic canal 外耳道; epr. epitympanic recess 鼓上隐窝; prm. promontorium 岬; tmr. tympanic ring 鼓环。Scale bars = 2 mm