Crayfish (Cambaroides japonicus) - Crayfish (English name)

Japanese: ザリガニ(躄蟹) - ザリガニ（英語表記）Cambaroides japonicus

A shrimp of the family Procambaridae endemic to Japan (illustration), it lives in mountain streams south of the Hidaka Mountains in Hokkaido, and in Aomori, Akita, and Iwate prefectures. The southern limit of its distribution is Ninohe City, Iwate Prefecture on the Pacific coast, and Odate City, Akita Prefecture on the Sea of Japan coast. Because of its limited distribution, it is not as familiar as the American crayfish (illustration), which was introduced from America. It grows to a body length of about 6 cm, but most individuals found in Honshu are about 4 cm, making it much smaller than the American crayfish. It is brown overall, with a flat abdomen dorsally and ventrally that appears wider than the cephalothorax.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

日本固有の甲殻綱アメリカザリガニ科のエビで，北海道日高山脈以南，青森県，秋田県，岩手県の渓流にすむk（イラスト）。分布の南限は太平洋側では岩手県二戸市，日本海側では秋田県大館市である。分布が限られているため，アメリカからの移入種であるアメリカザリガニ（イラスト）ほどなじみがない。体長6cmほどになるが，本州産の個体は4cmくらいのものが多く，アメリカザリガニよりもかなり小さい。全体に茶色で，腹部が背腹に平らで，頭胸甲に対して幅広い感じを受ける。

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