Figure 2 in A complex hyobranchial apparatus in a Cretaceous dinosaur and the antiquity of avian paraglossalia

Figure 2. Pinacosaurus grangeri from the Upper Cretaceous of Mongolia, showing accessory narial apertures. Top, ZPAL MgD II/1, juvenile specimen of P. grangeri showing intact narial region; inset at lower left shows homologous portion on IGM 100/3186. Lower right, ventral (palatal) view of rostrum, showing the opening of the right premaxillary palatal fenestra. Abbreviations: B, structure B in the narial region; C, apertures C in the narial region, opening into the premaxillary sinus cavity; mx, maxilla; mxo, maxillary osteoderm, pmx, premaxilla; ppf, premaxillary palatal fenestra; v, vomer.