| Aythya | |
|---|---|
| |
| Common pochard (Aythya ferina) | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Anseriformes |
| Family: | Anatidae |
| Tribe: | Aythyini |
| Genus: | Aythya F. Boie, 1822 |
| Type species | |
| Anas marila[1] Linnaeus, 1761 | |
| Species | |
|
12 species, see text | |
Aythya is a genusofdiving ducks. It has twelve described species. The name Aythya comes from the Ancient Greek word αυθυια (authuia), which may have referred to a sea-dwelling duck or an auklet.[2]
Aythya shihuibas was described from the Late MioceneofChina. Zelenkov (2016) transferred the species Anas denesi Kessler (2013), known from the late Miocene of Hungary, to the genus Aythya.[3] An undescribed prehistoric species is known only from Early Pleistocene fossil remains found at Dursunlu, Turkey;[4] it might however be referrable to a paleosubspecies of an extant species considering its age (see also Greater scaup).
The Miocene[verification needed] "Aythya" arvernensis is now placed in Mionetta, while "Aythya" chauvirae seems to contain the remains of two species, at least one of which does not seem to be a diving duck.[5]
The genus Aythya was introduced in 1822 by the German zoologist Friedrich Boie. The type species is the greater scaup.[6][7]
The genus contains 12 species.[8]
| Male | Female | Scientific name | Common name | Distribution | Conservation status |
|---|---|---|---|---|---|
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A. valisineria | Canvasback | North America | least concern |
 |
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A. ferina | Common pochard | Northern Europe into Asia | vulnerable |
 |
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A. americana | Redhead | North America, from as far north as Northern Canada to the lower United States | least concern |
 |
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A. collaris | Ring-necked duck | Northern United States and Canada | least concern |
 |
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A. australis | Hardhead | Australia, New Guinea, New Zealand, and the islands of the Pacific | least concern |
 |
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A. baeri | Baer's pochard | Southeast Russia and northeast China, migrating in winter to southern China, Vietnam, Japan, and India | critically endangered |
 |
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A. nyroca | Ferruginous duck | From Iberia and the Maghreb east to western Mongolia, south to Arabia | near threatened |
 |
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A. innotata | Madagascar pochard | Madagascar | critically endangered |
 |
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A. novaeseelandiae | New Zealand scaup | New Zealand | least concern |
 |
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A. fuligula | Tufted duck | Throughout temperate and northern Eurasia; occasional visitor to the United States and Canada | least concern |
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A. marila | Greater scaup | Alaska, northern Canada, Siberia, and the northernmost reaches of Europe | least concern |
 |
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A. affinis | Lesser scaup | Alaska through western Canada to western Montana, Central America | least concern |
Based on the Taxonomy in Flux from John Boyd's website.[9]
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| Aythya |
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