Gengoro (Cybister japonicus) - Gengoro (English spelling)

Japanese: ゲンゴロウ(源五郎) - ゲンゴロウ（英語表記）Cybister japonicus

An insect of the Dytisciidae family in the order Coleoptera (illustration). Its flat body spreads backwards, its back is black with a greenish-green tint, and its sides are edged with yellowish brown. Its body length is 35-40 mm. The tip of the male's front legs (tarsus) is wide, and the underside is a sucker, making it convenient for holding the female during mating. It is found throughout Japan, as well as in Taiwan, the Korean Peninsula, China, Siberia, and other areas. It was commonly found in ponds, swamps, and quiet rivers from plains to mountains, but its numbers have decreased dramatically due to development and the effects of pesticides.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

甲虫目ゲンゴロウ科の昆虫（イラスト）。扁平なからだは後方へ広がり，背面は緑光色を帯びた黒色で側縁は黄褐色に縁取られる。体長35～40mm。雄の前脚の先方(跗節（ふせつ）)は幅広く，裏側は吸盤になっていて交尾のとき雌を抱くのにつごうよくできている。日本全土のほか，台湾，朝鮮半島，中国，シベリアなどにも分布する。平地から山地までの池や沼，流れの静かな川にふつうに見られたが開発や農薬の影響などでその数は激減した。

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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