ungula

…Solar claws are also found on the first toe of the front paws of rodents, and the claws of hyraxes are also said to be solar claws. A hoof (or ungula) is similar to a claw, but the nail plate forms a cylinder, the bottom of which is covered by a nail bed, which completely covers the epiphalangeal part like a shoe, and in principle, only the hoof touches the ground when walking. It is seen in large herbivores such as odd-toed and even-toed ungulas, and is suitable for supporting heavy body weight and running on hard ground. …

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…ひらづめは齧歯類の前足の第1指にも見られ，ハイラックスのつめもひらづめだといわれる。　ひづめhoof(またはungula)は，かぎづめに似るが爪板が円筒を形成し，その底を爪床がふさぎ，これらで靴のように指骨端節部を完全に包み，原則としてひづめだけを地に着けて歩く。奇蹄類，偶蹄類など，大型の草食動物に見られ，重い体重を支えて硬い地面を走るのに適する。…

※「ungula」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