Figure 40. Character 83 in Morphology-based phylogenetic analysis and classification of the family Rhinocryptidae (Aves: Passeriformes)

Figure 40. Character 83 and its postulated states. Syrinx and lower trachea, lateral surface, musculature, configuration: A, not forming an intrinsic muscle – 83.0; B, forming a single pair of intrinsic muscles – 83.1; C, forming two pairs of intrinsic muscles – 83.2. Stippled areas are cartilaginous tissue, non-stippled areas are calcified structures. A1/B1 elements are indicated. Syringes of (A) Conopophaga lineata (MCP 2490), (B) Psilorhamphus guttatus (MCP 2699) and (C) Dendrocolaptes platyrostris (MCP 2602) in lateral view (A, B, left side; C, right side). Scale bars = 2 mm.