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Fig. 3. Ventral view of the superficial throat musculature in two anurans. (A) Undifferentiated m. intermandibularis posterior of a typical frog. (B) Differentiation of the m. intermandibularis posterior into two separate accessory slips in Phrynomantis bifasciatus. mm, mentomeckelian element; sm, m. submentalis; ip, m. intermandibularis posterior; m, mandible; ih, m. interhyoideus; ipa1, m. intermandibularis posterior accessory 1; ipa2, m. intermandibularis posterior accessory 2.