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Bufo bufo. Note the early onset of ossification (B, L) and retardation in development of the urostyle. (A, K) Stage 56; (B, G, L) stage 57; (C, H, M) stage 58; (D) stage 58–59; (E, N) stage 62; (F) stage 56; (I, O) stage 63; (J, P) stage 66 (A–E in ventral view; F–J in left lateral view; K–P in dorsal view). Scale bars in A–E, 5 mm.
