noun
chaetognath; arrow worm
Scientific term for any worm of the phylum Chaetognatha. Also referred to as 矢虫 (やむし).
See also: 矢虫
毛顎動物はプランクトンとして海洋に広く分布している。
Chaetognaths are widely distributed in the ocean as plankton.
Synonym for chaetognath; 矢虫 is a more common Japanese name, while 毛顎動物 is the formal zoological term.
From 毛 (もう, 'hair') + 顎 (がく, 'jaw') + 動物 (どうぶつ, 'animal'), referring to the bristle-like grasping spines around the mouth characteristic of this phylum.