After Livezey, 1996
<==o Oxyurini (viuhkasorsat ja sukulaiset) |-- Heteronetta atricapilla [Heteronettina] (loissorsa) `--o Oxyurina (viuhkasorsat) |--o Nomonyx [supergenus??] | `-- Nomonyx dominicus (naamioviuhkasorsa) `--o Oxyura [supergenus??] |--o Biziura (helttasorsat) | |-- B. lobata (helttasorsa) | `-- †B. delautouri [Uusi Seelanti] `--o Oxyura (viuhkasorsat) |-- (Oxyura) jamaicensis (kupariviuhkasorsa) `--o (Cerconectes) |--+-- O. (C.) ferruginea (andean duck) | `--+-- O. (C.) vittata (argentiinanviuhkasorsa) | `-- O. (C.) australis (australianviuhkasorsa) `--+-- O. (C.) maccoa (afrikanviuhkasorsa) `-- O. (C.) leucocephala (viuhkasorsa)
Reference(s):
- Ericson, P. G. P., 1996: Systematic relationships of the Palaeogene family Presbyornithidae (Aves: Anseriformes).
–Zoological Journal of the Linnean Society: vol. 121, #4, pp. 429-483 - Livezey, B. C. 1996: A phylogenetic classification of waterfowl (Aves: Anseriformes), including selected fossil species.
–Annals of Carnegie Museum: vol. 66, #4, pp. 457-496.