After Livezey, 1996
<==o Anatini (sorsat)
|--o Cairina ()?
| |--o Aix [supergenus]
| | `--o Aix (mandariinisorsat)
| | |-- A. sponsa (morsiosorsa)
| | `-- A. galericulata (mandariinisorsa)
| `--o Cairina [supergenus]
| |-- Pteronetta hartlaubii (kanelisorsa)
| `--o Cairina (myskisorsat)
| |-- C. moschata (myskisorsa)
| `-- C. scutulata (sumatransorsa)
`--+--o Nettapodina ()?
| |-- Chenonetta jubata (lyijysorsa)
| `--o Nettapus (kääpiösorsat)
| |-- N. (Nettapus) auritus (afrikankääpiösorsat)
| `--o N. (Cheniscus)
| |-- N. (C.) pulchellus (australiankääpiösorsa)
| `-- N. (C.) coromandelianus (aasiankääpiösorsa)
`-- Anatina (sorsat)
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.