Matsuoka H, Hasegawa Y. (2022). Annakacygna, a new genus for two remarkable flightless swans(Aves, Anatidae, Cygnini)from the Miocene of Gunma, central Japan: With a note on the birds' food niche shift and specialization of wings for parental care action. Bulletin of Gunma Museum of Natural History. 26: 1-30.
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Matsuoka H, Hasegawa Y
2022
Annakacygna, a new genus for two remarkable flightless swans(Aves, Anatidae, Cygnini)from the Miocene of Gunma, central Japan: With a note on the birds' food niche shift and specialization of wings for parental care action