|
The Anserinae is 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 containing the geese and the ducks, while the Cygninae contain the swans. ==Systematics== Swans – tribe Cygnini *Genus ''Cygnus'' – true swans :The black-and-yellow-billed swans are sometimes separated in the genus ''Olor''. True Geese – tribe Anserini *Genus ''Anser'' – grey geese *Genus ''Chen'' – white geese (sometimes included in ''Anser'') *Genus ''Branta'' – black geese Unresolved *Genus ''Coscoroba'' – coscoroba swan The following 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 Cereopsini *Genus ''Cereopsis'' – Cape Barren goose *Genus ''Cnemiornis'' – New Zealand geese (prehistoric) There are some enigmatic subfossils of very large goose-like birds from the Hawaiian Islands which 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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Anserinae」の詳細全文を読む スポンサード リンク
|