Oxyurinae
| Oxyurinae Temporal range: Late Oligocene to present |
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| Blue-billed duck (Oxyura australis) | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Anseriformes |
| Family: | Anatidae |
| Subfamily: | Oxyurinae |
| Genera | |
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Oxyura |
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Oxyura
Nomonyx
Biziura (but see text)
Heteronetta
The Oxyurinae are a subfamily of the duck, goose and swan family of birds, the Anatidae. It has been subject of considerable debate about its validity and circumscription. Most of its members have long, stiff tail feathers which are erected when the bird is at rest, and relatively large, swollen bills. Though their relationships are still enigmatic, they appear to be closer to swans and true geese than to the typical ducks. The highest diversity is found in the warmer parts of the Americas, but at least one species occurs in a major part of the world.
Their habitus resembles a freshwater diving duck, particularly when moving on dry land. Their legs are set far back, making them awkward walkers, so they rarely leave the water. When at rest, their tails are a notable difference as per above, and in the water they often swim very deep-set. Their unusual courtship displays involve drumming noises from inflatable throat sacs, head throwing, and erecting short crests. Most display singly with a very elaborate and peculiar display, but musk ducks congregate at leks and have a more limited display.
One mid-sized genus and two or three which are monotypic are described today:
The black-headed duck of Heteronetta is indisputably quite basal, looking more like a typical duck-like Anatidae with a short tail and normal bill. The masked duck of Nomonyx has a more intermediate position; it probably diverged from the lineage leading to the main radiation some time after Heteronetta.
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Wikipedia