Fig. 5.

Graphical reconstructions of internal structures of the cochlea of (A) basilosaurid Zygorhiza kochii, (B) odontocete Tursiops truncatus, and (C–L) extinct and extant mysticete cetaceans. Reconstructions follow Guild (1921), Schuknecht (1953), and Wever et al. (1971a,b). Graphical reconstructions such as these illustrate the relationships among internal cochlear structures and can be used to quickly observe dimensional changes across the cochlea. Morphologies of the bony labyrinths of (A) Tursiops truncatus and (H) Balaenopteridae (NC)† are described and illustrated further by Ekdale (2013). They are included here for comparison. Measurements taken from Table S3. Projections do not preserve three dimensional relationships among successive turns. Daggers (†) indicate extinct taxa. Anatomical abbreviations are listed at the end of the Materials and methods section.