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''Aythya'' is a genus of diving ducks. It has twelve described species. The name ''Aythya'' comes from the Ancient Greek word αυθυια, ''aithuia'', which may have referred to a sea-dwelling duck or an auklet. ''Aythya shihuibas'' was described from the Late Miocene of China. An undescribed prehistoric species is known only from Early Pleistocene fossil remains found at Dursunlu, Turkey;〔Louchart, Antoine; Mourer-Chauviré, Cécile; Guleç, Erksin; Howell, Francis Clark & White, Tim D. (1998): L'avifaune de Dursunlu, Turquie, Pléistocène inférieur: climat, environnement et biogéographie. ''C. R. Acad. Sci. Paris IIA'' 327(5): 341-346. (with English abridged version ) (HTML abstract) 〕 it might however be referrable to a paleosubspecies of an extant species considering its age (see also Greater scaup). The Miocene ''"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.〔Worthy, Trevor H.; Tennyson, A.J.D.; Jones, C.; McNamara, J.A. & Douglas, B.J. (2007): Miocene waterfowl and other birds from central Otago, New Zealand. ''J. Syst. Palaeontol.'' 5(1): 1-39. (HTML abstract) 〕 ==''Aythya'' species== * Canvasback (''A. valisineria''), least concern * Common pochard (''A. ferina''), least concern * Redhead (''A. americana''), least concern * Ring-necked duck (''A. collaris''), least concern * Hardhead (''A. australis''), least concern * Baer's pochard (''A. baeri''), critically endangered * Ferruginous duck (''A. nyroca''), near threatened * Madagascar pochard (''A. innotata''), critically endangered * New Zealand scaup (''A. novaeseelandiae''), least concern * Tufted duck (''A. fuligula''), least concern * Greater scaup (''A. marila''), least concern * Lesser scaup (''A. affinis''), least concern File:Canvasback pair2.jpg|Canvasback (''Aythya valisineria'') File:Aythya ferina (Marek Szczepanek).jpg|Common pochard (''Aythya ferina'') File:Redhead_duck_(Aythya_americana,_male).jpg|Redhead (''Aythya americana'') File:Aythya-collaris-001.jpg|Ring-necked duck (''Aythya collaris'') File:Female Hardhead duck.jpg|Hardhead (''Aythya australis'') File:Qtqy.jpg|Baer's pochard (''Aythya baeri'') File:Aythya nyroca16.jpg|Ferruginous duck (''Aythya nyroca'') File:AythyaInnotata.svg|Madagascar pochard (''Aythya innotata'') File:NZ Scaup 01.jpg|New Zealand scaup (''Aythya novaeseelandiae'') File:Tufted-Duck-male-female.jpg|Tufted duck (''Aythya fuligula'') File:Greater-scaup-male2.jpg|Greater scaup (''Aythya marila'') File:Veilchenente Aythya affinis 0505282.jpg|Lesser scaup (''Aythya affinis'') 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Aythya」の詳細全文を読む スポンサード リンク
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