Shojin crab (English name: Plagusia dentipes)

Japanese: ショウジンガニ(精進蟹) - ショウジンガニ（英語表記）Plagusia dentipes

This crab belongs to the family Grapsidae and lives on open ocean reefs, moving quickly across the surface of the rocks underwater (illustration). Its carapace is rounded and rectangular, measuring about 4.5 cm wide and 4 cm long, and is covered with short hairs. Its forehead is narrow and protruding, with a somewhat deep central groove. The first antennae are folded vertically on either side of the forehead and can be seen from the back. The front edge of the carapace has four serrated projections, and the front edges of the long segments of the ambulatory legs are also serrated. Its color is reddish brown, but the granules covering its chelipeds are dark red.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

甲殻綱イワガニ科のカニで，外洋性の岩礁にすみ，水中の岩の表面をすばやく歩き回る（イラスト）。甲幅4.5cm，甲長4cmくらいの丸みを帯びた四角形で，短毛で覆われている。額は狭くて突き出し，中央の溝がやや深い。第1触角は額の両側に縦にたたまれ，背面から見ることができる。甲の前側縁には四つの突起が鋸歯状に並び，歩脚の長節の前縁もやはり鋸歯状である。赤褐色であるが，はさみ脚を覆う顆粒（かりゆう）は濃赤色。

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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