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Concept
Anserinae
Summary
The Anserinae are a subfamily in the waterfowl family Anatidae. It includes the swans and true geese. Under alternative systematical concepts (see e.g., Terres & NAS, 1991), it is split into two subfamilies, the Anserinae contain the geese and the ducks, while the Cygninae contain the swans.
Swans (Tribe Cygnini)
Genus Cygnus – true swans: The black-and-yellow-billed swans are sometimes separated in the genus Olor.
Genus †Afrocygnus (Miocene of North Africa)
Genus †Annakacygna – short-winged swans (Miocene of Japan)
Genus †Megalodytes (Miocene of Japan and California)
True geese (Tribe Anserini)
Genus Anser – grey and white geese
Genus Branta – black geese
Unresolved
Genus Coscoroba – coscoroba swan
These two genera are distinct from other geese and often elevated to a subfamily of their own (Cereopsinae), or alternatively into the shelduck subfamily Tadorninae:
Tribe Cereopseini
Genus Cereopsis – Cape Barren goose
Genus †Cnemiornis – New Zealand geese (prehistoric)
Some enigmatic subfossils of very large goose-like birds from the Hawaiian Islands do not appear to be moa-nalos (goose-sized dabbling ducks). They cannot be assigned to any genus living today, though most, if not all, may be fairly close to Branta:
Geochen rhuax – initially allied with Cereopsis, but this seems hardly correct for reasons of biogeography.
Giant Hawaiʻi goose, ?Branta sp.
Giant Oʻahu goose, Anatidae sp. et gen. indet.
Official source
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