. Bulletin of the British Ornithologists' Club. Vol. 88 12 Bulletin Aythyini x Anatini Crosses studied Netta rufina X Anas platyrhynchos X Anas poeciloryhncha Forster Spot-billed Duck Netta peposaca (Vieillot) Rosybill X Anas aucklandica (G. R. Gray) Brown Teal Aythya fuligula X Anas qiierquedula The hybrids between these two tribes are perhaps the most interesting because of the widely differing forms in the parent species. rufina has hybridised with two typical species of Anas. (Fig. 6). The trachea of the hybrid with platyrhynchos is not different in size from the parents but the trac
. Bulletin of the British Ornithologists' Club. Vol. 88 12 Bulletin Aythyini x Anatini Crosses studied Netta rufina X Anas platyrhynchos X Anas poeciloryhncha Forster Spot-billed Duck Netta peposaca (Vieillot) Rosybill X Anas aucklandica (G. R. Gray) Brown Teal Aythya fuligula X Anas qiierquedula The hybrids between these two tribes are perhaps the most interesting because of the widely differing forms in the parent species. rufina has hybridised with two typical species of Anas. (Fig. 6). The trachea of the hybrid with platyrhynchos is not different in size from the parents but the tracheal tube is a little wider at its anterior and posterior ends reflecting rufina. The syrinx is distinctly intermediate with a bulla that is largely ossified and partially rounded reflecting Anas. The characteristics of Netta show as a narrowing of the bulla with a ventral line near to the tracheal tube, several small fenestrae on the ventral surface and a single medium sized fenestra on each of the lateral faces. In the hybrid between rufina and poecilorhyncha the bulla is even more angular and fenestrated but otherwise the trachea is similar to that of the previous hybrid. peposaca has a typical aythyine trachea but the tracheal tube is dilated around the mid-point. This does not show in the hybrid with aucklandica which has a small but typical anatine trachea. The hybrid syrinx is inter- mediate in size and form. It has a broad connection with the tracheal tube and a partially rounded and fenestrated bulla which lies close to the tracheal tube (Fig. 6).. 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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