. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 104 C. Brown & D. Ward. Fig. 11 (left): Longitudinal section of the syrinx of the Namaqua Sandgrouse Píemeles nama- qua. Brl = first bronchial semiring; ITM = internal tympaniform membrane; SLM = semi- lunar membrane; Tri = first tracheal ring; P = pessulus; TLM = tracheolaterahs muscle; t = tail, shading as for Fig. 1. Fig. 12 (right): Longitudinal section of the syrinx of the Kelp Gull Lams dominieanus. Br = bronchial semiring; ITM = internal tympaniform membr
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 104 C. Brown & D. Ward. Fig. 11 (left): Longitudinal section of the syrinx of the Namaqua Sandgrouse Píemeles nama- qua. Brl = first bronchial semiring; ITM = internal tympaniform membrane; SLM = semi- lunar membrane; Tri = first tracheal ring; P = pessulus; TLM = tracheolaterahs muscle; t = tail, shading as for Fig. 1. Fig. 12 (right): Longitudinal section of the syrinx of the Kelp Gull Lams dominieanus. Br = bronchial semiring; ITM = internal tympaniform membrane; SLM = semilunar membrane; Tr = tracheal ring; P = pessulus. Shading as for Fig. 1. Charadrii had highly ossified tracheal rings which were fused at the tympanum and they had a bony pessulus. The divergence of these two groups agrees with the evidence of Strauch (1978) and Sibley & Ahlquist (1985), using skeletal and biochemical characters, respectively. Of the scolopacids examined, the only species with a bony pessulus was Philomachus pugnax. We suggest that there is a trend in the Scolopacidae of a reduction in the pessulus with Gallinago nigripennis most recently evolved, since it has no pessulus at all. Within the scolopacids, only Tringa glareola lacked ossification in the tympanic region of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Zoologisches Forschungsinstitut und Museum Alexander Koenig. Bonn : Das Forschungsinstitut
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