Fig. 7

Smilisca phaeota, cartilaginous development of the branchial basket. Azan‐stained, transverse histological sections of several developmental stages from left to right: stage A9 (first column), stage D1 (second column), stage D5 (third column), stage C2 (fourth column), and stage C6 (fifth column) showing the chondrification process of the hypobranchial plate and the ceratobranchials I–IV. 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.