Mitsumata Yariuo (English spelling) Black Dragonfish

Japanese: ミツマタヤリウオ - みつまたやりうお（英語表記）black dragonfish

A deep-sea fish of the family Odontocetiidae in the order Anguilliformes. The body is eel-shaped, with the dorsal and anal fins making up about 2/3 and 1/3 of the rear of the body, respectively. The pelvic fins are located slightly behind the anterior 1/3 of the body. Females have a barbel with a light-emitting organ on the lower jaw and reach a body length of over 30 cm. Males are barbel-less and reach an adult body length of about 5 cm, showing marked sexual dimorphism. There are two rows of light-emitting organs on each side along the underside of the body and ventral surface, from just below the pectoral fin to near the tail fin. In males, the light-emitting organ is the same size as the eye diameter or slightly larger, but in females it is smaller than the eye diameter.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ワニトカゲギス目ミツマタヤリウオ科の深海魚。体はウナギ形で，背びれとしりびれは体全体の後からそれぞれ約2/3と1/3の部分を占める。腹びれは体の前1/3よりやや後にある。雌は下あごに発光器をもつ1本のひげをもち，体長30cm以上に達する。雄はひげがなく体長5cmほどで成魚となり，著しい性的2型を示す。体側の下側と腹面に沿って胸びれ直下から尾びれ近くまで左右2列ずつの発光器列がある。雄では眼の直後に眼径と同大，またはそれよりやや大きい発光器があるが，雌では眼径より小さい。

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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