. Bulletin of the British Ornithologists Club. . Figure 1: Character states of the dorsal pneumatic foramen and dorsal sulcus of the sternum of Passeriformes. A. Dorsal foramen and accompanying foramina absent (Passeridae: Passer domesticus). B-E. Dorsal foramen present, showing extreme and intermediate states of accompanying foramina surrounding the foramen and extending caudally along the dorsal sulcus: B. Pittidae: Pitta versicolor: C. Menuridae: Menura novaehollandiae; D. Meliphagidae: Phylidonyris nigra; E. Pachycephalidae: Pachycephala simplex, df = dorsal foramen, ds = dorsal P
. Bulletin of the British Ornithologists Club. . Figure 1: Character states of the dorsal pneumatic foramen and dorsal sulcus of the sternum of Passeriformes. A. Dorsal foramen and accompanying foramina absent (Passeridae: Passer domesticus). B-E. Dorsal foramen present, showing extreme and intermediate states of accompanying foramina surrounding the foramen and extending caudally along the dorsal sulcus: B. Pittidae: Pitta versicolor: C. Menuridae: Menura novaehollandiae; D. Meliphagidae: Phylidonyris nigra; E. Pachycephalidae: Pachycephala simplex, df = dorsal foramen, ds = dorsal 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 British Ornithologists Club. Oxford : Clarendon Press
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