Fig. 3 in Eight Species Of Anuran Amphibians (Amphibia, Anura) Found In Ukraine: Comparative Morphology And Classification Of Larval Development Stages

Fig. 3. Stages of operculum's development: 6 — operculum touches the belly skin or accretes it, gills can be seen from both sides; 7 — operculum completely covers gills from one (right) side; 8 — external gills are completely covered by operculum.