FIG. 3 in New material of Eocene Helaletidae (Perissodactyla, Tapiroidea) from the Irdin Manha Formation of the Erlian Basin, Inner Mongolia, China and comments on Related Localities of the Huheboerhe Area

FIG. 3. Right petrosal of Paracolodon fissus (IVPP V 22640). Parallel lines indicate damaged surfaces. The anteroposterior length of the promontorium is about 14.66 mm. Abbreviations: bg, basicapsular groove; bo, basiocciptial; bs, basisphenoid; ci, crista interfenestralis; ctp, caudal tympanic process; eam, external acoustic meatus; fc, fenestra cochleae; fs, facial sulcus; fv, fenestra vestibuli; gpns, greater petrosal nerve sulcus; hf, hypoglossal foramen; mlf, middle lacerate foramen; oc, occipital condyle; p, promontorium; pgp, postglenoid process; pcop, paracondylar process; s, squamosal; sf, stapedial muscle fossa; sff, secondary facial foramen; ts, transpromontorial sulcus; ttf, fossa for the tensor tympani muscle.