Bluebella (Chinese bell) - Bluebella

...The name "Kyusen" was given to this species in Misaki, Kanagawa Prefecture, because the female of this species has a black stripe that crosses the eye and reaches the tail fin, and about nine stripes, including red dots above and below it. The body color and markings of the Labridae family are often different between males and females, and this species is a typical example of this. The body color of the male is more blue than that of the female, which is why the female is commonly called "Aobera". All species of the genus Kyusen, except for this species and the Honbera, are tropical and are widely distributed from the Indian Ocean to the Pacific Ocean, living around shallow reefs and coral reefs, and are known for their habit of burrowing into the sand to sleep at night. ...

*Some of the terminology explanations that mention "Aobera (Kyusen)" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…キュウセンは本種の雌の体側に眼を横切って尾びれに達する黒帯と，その上下にある赤い点条を含めて約9本の線条が見られることからつけられた神奈川県三崎での呼称。ベラ科の魚は雌雄で体色，斑紋が違うことが多いが，本種はその代表的なもので，俗に雌のアカベラに対し，雄はアオベラと呼ばれるように体色は青みが強い。キュウセン属は本種とホンベラ以外はすべて熱帯性でインド洋から太平洋に広く分布し，浅い岩礁やサンゴ礁周辺にすみ，夜は砂中に潜って眠る習性のあることで知られている。…

※「アオベラ（キュウセン）」について言及している用語解説の一部を掲載しています。

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