nail

…The claws on the front paws of moles are broad and flat, and at first glance resemble the following flat nails, but they are merely a shovel-like modification of the claw. Flat nails are found in primates, where the nail plate covers only the upper surface of the apophyseal region, the nail bed is small, and most of the sensitive tip of the finger is exposed. Flat nails are probably a modification of the claw as an adaptation for grasping objects with the fingers. …

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…モグラの前足のつめは，幅が広く扁平で，一見次のひらづめに似るが，かぎづめがスコップ状に変形したものにすぎない。　ひらづめnailは，霊長類に見られ，爪板が指骨端節部の上面しか覆わず，爪床が小さく，感覚の鋭敏な指端部が大部分露出している。ひらづめは，指で物を握るのに適応して，かぎづめが変化したものであろう。…

※「nail」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