Parent: Anatidae (Ducks)

└─ Aythya (Diving ducks)

└─── Aythya affinis (Lesser scaup)

└─── Aythya americana (Redhead)

└─── Aythya australis (Hardhead)

└─── Aythya baeri (Baer's pochard)

└─── Aythya collaris (Ring-necked duck)

└─── Aythya ferina (Common pochard)

└─── Aythya fuligula (Tufted duck)

└─── Aythya innotata (Madagascar pochard)

└─── Aythya marila (Greater scaup)

└─── Aythya novaeseelandiae (New zealand scaup)

└─── Aythya nyroca (Ferruginous duck)

└─── Aythya valisineria (Canvasback)