Flower mantis shrimp (Odontodactylus japonicus)

Japanese: ハナシャコ(花蝦蛄) - ハナシャコ(英語表記)Odontodactylus japonicus
Flower mantis shrimp (Odontodactylus japonicus)
A crustacean of the family Anthopodidae in the order Stomatopoda. This beautifully colored mantis shrimp is relatively large, reaching a body length of about 15 cm. The dorsal surface of the body is smooth and arched. The base of the phalanges of the prehensile legs is swollen, with 5 to 7 small spines on the inner surface. The sixth abdominal segment and telson segment have many vertical ridges. While it is usually difficult to distinguish between males and females of mantis shrimps based on body color, this species is unusual in that the sexes have different body colors. The dorsal surface of the male's body is brownish red overall, but the front half of the female's body is brownish red and the back half is blue-green.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
口脚目ハナシャコ科の甲殻類。体長15cmくらい,やや大型の美しい色彩を帯びたシャコ。体の背面は滑らかで,アーチ状をしている。捕脚の指節の基部は膨れ,その内面に5~7の小棘(しようきよく)がある。第6腹節と尾節に多くの縦の隆起線がある。シャコ類ではふつう,体色などで雌雄を分けることが困難であるが,この類では珍しく雌雄で体色が異なっている。雄の体背面は全体に褐紅色をしているが,雌では体の前半が褐紅色,後半が藍緑色をしている。

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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