Cryptoblepharus boutonii (English spelling)

...The "window" allows the lizard to see outside even when the lower eyelid is closed, which is useful for lizards that often burrow into sand or soil. In the Bonin Skink, Cryptoblepharus boutonii (total length 10 cm), the lower eyelid, consisting of a circular transparent membrane, is attached to the upper eyelid, covering and protecting the eye. This snake-like eye has the same structure as the eyes of geckos, which hide in narrow gaps such as under bark, and is ideal for Bonin Skinks, who are active on tree trunks and fallen logs and can quickly hide in gaps. ...

*Some of the terminology that mentions "Cryptoblepharus boutonii" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…〈窓〉は下まぶたを閉じても外が見え，砂や土に潜ることの多いトカゲには有用。オガサワラトカゲCryptoblepharus boutonii(全長10cm)では，円形の透明な膜からなる下まぶたが上まぶたに固着し，眼を覆って保護している。このようなヘビ型の眼は，樹皮の下など狭い隙間に隠れるヤモリの眼と同じ構造で，オガサワラトカゲが木の幹や倒木を活発に行動し，すばやく隙間に隠れるのに好つごうである。…

※「Cryptoblepharus boutonii」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