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. 4 Skulls of Bounomys ulantatalensis from the Ulantatal Formation of Ulantatal area, Alxa Left Banner, Nei Mongol A, B. IVPP V 26128 in right lateral view; C, D. V 26125 in left lateral view Abbreviations: bf. buccinator foramen 颊肌神经孔; eam. external acoustic meatus 外耳门; ef. ethmoidal foramina 筛孔; fo. foramen ovale 卵圆孔; lf. lacrimal foramen 泪孔; opc. optic canal 视神经孔; os. orbitosphenoid 眶蝶骨; sof. sphenorbital fissure 蝶眶裂; spf. sphenofrontal foramen 蝶额孔; spl. sphenopalatine foramen 蝶腭孔; other abbreviations see Figs. 2, 3