Spider crab - Oncinopus aranea

Japanese: クモガニ(蜘蛛蟹) - クモガニ（英語表記）Oncinopus aranea

A long-legged crab of the family Araneidae (Crustacea). Its carapace is about 2 cm long and triangular, and is not very hard. It is generally reddish yellow, but the first two pairs of walking legs are edged with yellow setae. Its phalanges are sickle-shaped, but the last two pairs of legs form incomplete claws with their pronodes and phalanges. It is distributed from Tokyo Bay to Kyushu, living on rocky seabeds at depths of 30 to 50 m, but its population is small. The name "kumogani" is more often used to mean "spider crab." In this case, it also includes the important edible snow crab, the world's largest spider crab, and the four-legged crab and the isokuzu crab, which are common on rocky shores.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

甲殻綱クモガニ科の歩脚の長いカニ（イラスト）。甲長2cmほどの長三角形で，甲はあまり硬くない。全体に赤黄色であるが前2対の歩脚は黄色の剛毛で縁取られる。指節が鎌形であるが，後2対の脚は前節と指節で不完全なはさみを形成する。東京湾から九州まで分布し，水深30～50mの岩場の海底にすむが，個体数は少ない。クモガニの名はむしろクモガニ類spider crabの意味で使われることが多い。この場合は，食用として重要なズワイガニや世界最大のタカアシガニ，磯に多いヨツハモガニやイソクズガニなども含まれる。

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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