. Bulletin of the British Ornithologists' Club. N. erythrophthalama. A. fuligula Hybrid A. ferina Hybrid A. nyroca Fig. 4. Tracheae and syringes of hybrid Aythyini—Netta crosses and Aythya crosses. Ventral view x f The general form of the trachea of the Anatini has been described above. In the Cairinini the syrinx is highly variable in size and form. For example in Nettapus, spp., the Pygmy Geese, the bulla is extremely small, in Plectropterus, the Spur-winged Goose, it is large, discoidal and ossified but thin walled. brasiliensis has a small syrinx indistinguishable in form from many of the
. Bulletin of the British Ornithologists' Club. N. erythrophthalama. A. fuligula Hybrid A. ferina Hybrid A. nyroca Fig. 4. Tracheae and syringes of hybrid Aythyini—Netta crosses and Aythya crosses. Ventral view x f The general form of the trachea of the Anatini has been described above. In the Cairinini the syrinx is highly variable in size and form. For example in Nettapus, spp., the Pygmy Geese, the bulla is extremely small, in Plectropterus, the Spur-winged Goose, it is large, discoidal and ossified but thin walled. brasiliensis has a small syrinx indistinguishable in form from many of the Anatini. The hybrid with flavimstn'.s has a syrinx the same size as the latter and is a little more angular but typically anatine in form (Fig. 5). The bulla oi sponsa is rounded and ovoid with the long axis running from. 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. London : British Ornithologists' Club
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