Fig. 5

Smilisca phaeota, cartilaginous development of the palatoquadrate and its associated structures. Azan‐stained, transverse histological sections of several developmental stages from left to right: stage A9, stage D1, stage D5, stage C2, and stage C6 showing the chondrification process of the muscular process, quadratocranial commissure, subocular bar, ascending process, and larval otic process. See Fig. 2 for more details on the stages. Empty squares indicate the absence of the structure in the respective stage. Scale bars indicate 100 μm.