FIG. 126 in Alcidedorbignya inopinata, a basal pantodont (Placentalia, Mammalia) from the early Palaeocene of Bolivia: anatomy, phylogeny and palaeobiology

FIG. 126. — Digital rendering based on CT data (left) and schematic drawing (right) of the left ectotypmpanic and partial malleus of Pantolambda bathmodon (AMNH 16663). Cracks and breakages of the specimen have been omitted on the drawings. A, lateral view; B, medial view; C, anterior view; D, posterior view; E, posteromedial view. Abbreviations: afpe, articular facet for the petrosal; afpge, articular facet for the postglenoid eminence; afthl; articular facet for the tympanohyal; art, arc of the ectotympanic; cc, capitular crest; ct, crista tympanica; gct?, possible groove for the passage of the chorda tympani; Glf, Glaserian fissure; hm, head of the malleus; iaf, inferior articular facet of the malleus for the incus; lbact, lateral branch of the anterior crus of the tympanic; map, medial articular process of the anterior crus of the tympanic; mbact, medial branch of the anterior crus of the tympanic; mbt, medial blade of the tympanic; nm, neck of the manubrium; ol, osseous lamina; pct, posterior crus of the tympanic; rpm, rostral process of the malleus; sat, sulcus for auditory tube; sp, styliform process; st, sulcus tympanicus; suaf, superior articular facet of the malleus for the incus; veeam, ventral edge of the external acoustic meatus. Scale bars: 2 mm. The 3D rendering of CT data is available in pdf format at the address http://sciencepress.mnhn.fr/en/periodiques/geodiversitas/37/4/alcidedorbignya-inopinata-additional-files.