Rana rugosa (Japanese earth frog)

Japanese: ツチガエル(土蛙) - ツチガエル（英語表記）Rana rugosa

A frog of the Ranidae family (illustration), commonly known as the Ibogaeru in Japan. It is distributed throughout Honshu, Shikoku, Kyushu, Yakushima, and the Korean peninsula, and is commonly seen in streams, ponds, rice fields, and slightly dirty ditches, but its dull body color makes it inconspicuous. Males are 3.5-4.5cm long, while females are about 6cm long. There are numerous wart-like protuberances on the back of the body, which form prominent ridges on the limbs. Most of the larvae overwinter, and some can reach a total length of 8cm. The breeding season is from May to August, and the frogs lay about 1,000 eggs at a time on aquatic plants.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

日本で俗にイボガエルとも呼ばれるアカガエル科のカエル（イラスト）。本州，四国，九州，屋久島，朝鮮半島に分布し，小川，池，水田や少し汚れた溝にもふつうに見られるが，じみな体色であまり目だたない。体長は雄3.5～4.5cm，雌6cmほど。体背面には多数のいぼ状隆起があって，四肢では顕著な隆条となる。幼生の多くは越冬し，全長8cmに達するものもある。繁殖期は5～8月ごろで一度に1000個ほどの卵を水草に産みつける。

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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