Fig. 1 in Composition of the canid auditory bulla and a new look at the evolution of carnivoran entotympanics

Fig. 1 Simplified diagram showing the spatial relations between the 'caudal entotympanic' portion of the auditory bulla (left semicircles) and the principal sinus contributing to the bullar inflation and septal formation in the Aeluroidea (e.g. felids) (a) and Cynoidea (canids) (b). Ventral views of left auditory bulla. Rostral entotympanic is not shown. Dotted lines indicate where the aeluroid septum bullae and cynoid intrabullar septum start to develop. Abbreviations: CES, caudal entotympanic sinus; T, ectotympanic; VES, ventral entotympanic sinus