Fig. 4

Vibratory membranes of the black jacobin’s syrinx. a and b, surface renderings and (c), dissected syrinx. a, ventral view and (b) and (c), caudal view. In b, the first three pairs of bronchial half-rings and all pairs of vibratory membranes: LL (orange), MTM (green), ML (pink), ML extension (purple). PES, pessulus; ML, medial labium; MTM, medial tympaniform membrane; LL, lateral labium; B1, first bronchial half-ring; B2, second bronchial half-ring and ML ext., the cartilaginous extension of the ML