Chin hair - Gakumo

Japanese: 顎毛 - がくもう
Chin hair - Gakumo

…They have a pair of eyes on the back of their head and a mouth that opens on the ventral side. They also have 7 to 13 chitinous jaw hairs on each side that bend inward at the tips, and use them to hold zooplankton in their mouths. The jaw hairs are unique to this species, and for this reason they are called chaetognaths. …

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…頭部の背面に1対の眼点があり,腹面に口が開く。またキチン質の顎毛が左右に7~13本あって先端が内側に曲がり,これで動物性のプランクトンをはさんで口へ運ぶ。顎毛はこの類に特有なものであって,このために毛顎動物と呼ばれている。…

※「顎毛」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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