Chaetognatha; arrow worms
Scientific taxonomic term for the phylum of arrow worms, used in biology and zoology.
The phylum Chaetognatha occupies an important position as marine plankton.
The term is composed of 毛 (hair/bristle), 顎 (jaw), 動物 (animal), and 門 (phylum), reflecting the bristle-like structures around the mouth of arrow worms.