alula

Japanese: alula
alula

...There are 6 (hummingbirds) to 32 (albatrosses) secondary feathers. The alula (bastard wing) is a feather attached to the first phalanges and consists of several small feathers. The wing coverts are feathers that cover the base of the flight feathers. There are upper coverts on the upper side and lower coverts on the lower side. The upper coverts are divided into primary, greater, middle and lesser coverts. ...

*Some of the terminology that mentions "alula" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…次列風切は6枚(ハチドリ)~32枚(アホウドリ)である。小翼羽alula(bastard wing)は第1指骨に付着している羽毛で,数枚の小型の羽毛から成る。雨覆(あまおおい)wing covertは風切羽の基部をおおっている羽毛で,翼上面の上雨覆と下面の下雨覆との区別があり,上雨覆は初列雨覆,大雨覆,中雨覆,小雨覆に分けられる。…

※「alula」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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