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Wasn't Malacorhynchus in Tadorninae, rather then in Anatinae?
In Livezey's (1996) review of the tadornine-anatine divergence, 12 of the 13 studies he cited regarded Malacorhynchus as an anatine: the only one that supported its inclusion within Tadorninae was Livezey (1986)!
A phylogenetic reassessment of the Tadorninae-Anatinae divergence (Aves: Anseriformes: Anatidae).