. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. The syrinx in the Charadriiformes 99. Fig. 1 (left): Longitudinal section of the syrinx of the Doublebanded Courser Rhinoptilus afri- canus. Br = bronchial semiring; ETM = external tympaniform membrane; ITM = internal tympaniform membrane; M = marrow cavity; P = Pessulus; SLM = semilunar membrane; Tr = tracheal ring. Tissue types are shaded as follows: cartilage = dotted; connective tissue = hatched; bone ^ black. Fig. 2 (right): Longitudinal section of the syrinx o
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. The syrinx in the Charadriiformes 99. Fig. 1 (left): Longitudinal section of the syrinx of the Doublebanded Courser Rhinoptilus afri- canus. Br = bronchial semiring; ETM = external tympaniform membrane; ITM = internal tympaniform membrane; M = marrow cavity; P = Pessulus; SLM = semilunar membrane; Tr = tracheal ring. Tissue types are shaded as follows: cartilage = dotted; connective tissue = hatched; bone ^ black. Fig. 2 (right): Longitudinal section of the syrinx of the Bronzewinged Courser Rhinoptilus chalcopterus. Br = bronchial semiring; C = connective tissue (dense); ITM = internal tym- paniform membrane; M ^ marrow cavity; P = pessulus; SLM = semilunar membrane; Tr = ridge on the posterior and anterior edges of the laterally-flattened tracheal rings. Shading as for Fig. 1. rounded or only slightly flattened in transverse section. The unmodified bronchial rings were cartilaginous and rounded. There was considerable interspecific variation in the structure of the semilunar membrane and pessulus of the species examined, with a number of trends evident. The burhinids, larids and pteroclids all had a large septum with a pessulus consisting of a number of pieces of cartilage. The pessulus of the Kelp Gull Lams dominicanus (Laridae — Fig. 12) also consisted of a number of cartilage pieces, although it was not possible to discriminate other features of this species' syrinx because of the dif-. 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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