noun
saddleback butterflyfish; saddled butterflyfish
A species of butterflyfish (Chaetodon ephippium) found in the Indo-Pacific, known for the large black saddle-like marking on its back.
ダイバーはサンゴ礁でセグロチョウチョウウオを見つけた。
The diver spotted a saddleback butterflyfish on the coral reef.