Hotei-eso (English spelling) scaleless black dragonfish

Japanese: ホテイエソ - ほていえそ（英語表記）scaleless black dragonfish

A deep-sea fish of the family Polytminae in the order Polytminae (illustration). It has one barbel equipped with a light-emitting organ at the tip of its lower jaw. Its body is long and slender, almost cylindrical. It uses the light-emitting organ on its barbel to lure prey, and then uses its sharp teeth to catch and swallow whole fish, even fish of the same size as itself. Its teeth can only be tilted inward in its mouth, making it difficult for prey to escape once caught. This feeding habit has made it well adapted to the deep sea, where there is little food. It has a large, long, slender light-emitting organ just in front of its eyes, and there are also rows of dot-like light-emitting organs along the underside of its body and the ventral surface.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ワニトカゲギス目ホテイエソ科の深海魚（イラスト）。下あごの先端に発光器を備えたひげが1本ある。体は細長く円筒状に近い。ひげの発光器で餌を誘い，自分と同じくらいの大きさの魚でも鋭い歯で捕食し丸のみにする。歯は口の内側方向にだけ倒すことができ，一度とらえた餌を逃しにくくしている。このような捕食習性で餌の少ない深海によく適応している。眼の直前に細長い大きな発光器があり，体側の下側と腹面に沿っても点状の発光器列がある。

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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