Parent: Anatidae (Ducks)

└─ Oxyura (Stiff-tailed ducks)

└─── Oxyura australis (Blue-billed duck)

└─── Oxyura ferruginea (Andean duck)

└─── Oxyura jamaicensis (Ruddy duck)

└─── Oxyura leucocephala (White-headed duck)

└─── Oxyura maccoa (Maccoa duck)

└─── Oxyura vittata (Lake duck)