Fig. 6

Smilisca phaeota, cartilaginous development of the ceratohyal and basibranchial. Azan‐stained, transverse histological sections of stage A9 (first column), stage D1 (second column), stage D5 (third column), stage C2 (fourth column), and stage C6 (fifth column) show the chondrification process of the ceratohyal corpus, anterior process, lateral process, articular condyle, and basibranchial. 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.