Hakone salamander (Onychodactylus japonicus)

Japanese: ハコネサンショウウオ(箱根山椒魚) - ハコネサンショウウオ（英語表記）Onychodactylus japonicus

A mountain stream salamander of the Hynobiidae family (illustration). Found in Honshu and Shikoku, it is about 10-19 cm long with a tail that is more than half that length. Males are generally larger than females. Even after metamorphosis, it does not develop lungs and breathes exclusively through its skin. This species and the false hakone salamander O. fischeri found on the Korean peninsula and Primorsky Krai form a single genus. The dorsum of the body is dark brown or black with a reddish orange stripe in the center, but there is a wide variation in body color and markings. It lives around mountain streams at altitudes of 500-2500 m. During the breeding season, both males and females develop horny black claws at the tips of each finger, and the male's hind legs become enlarged and the outer edge of the fifth toe also becomes wider.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

サンショウウオ科の渓流性サンショウウオ（イラスト）。本州，四国に分布し，全長10～19cmほどで尾はその半分よりも長い。一般に雄は雌よりも大きい。変態後も肺を生ぜず，もっぱら皮膚呼吸を行い，本種と朝鮮半島，沿海州産のハコネサンショウウオモドキO.fischeriとで1属を構成する。体背面は紫がかった暗褐色か黒色で，中央部には赤みがかったオレンジ色の帯模様があるが，体色，斑紋には変異が多い。標高500～2500mの山地の渓流周辺部にすみ，繁殖期には雌雄ともに各指の先端に角質の黒いつめを生じ，また雄の後肢が肥大し第5趾（し）の外縁も広がる。

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

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