Horseshoe crab (Japanese name: Kabutogani)

Japanese: カブトガニ(兜蟹∥甲蟹∥鱟魚) - カブトガニ（英語表記）horse‐shoe crab

An arthropod of the family Horseshoe crab, order Scyphomorpha, that lives in shallow waters and is closely related to arachnids (illustration). Its body is divided into a horseshoe-shaped anterior body covered by a cephalothorax, a posterior body covered by a plastron, and a sword-shaped tail, giving it the appearance of a fan shape. The body is shiny green-brown. The three body parts are connected to each other at the joints and can move. It grows to a total length of about 60 cm. The dorsal surface of the cephalothorax has two small simple eyes in the center of the front, and one compound eye on each side behind the ridges. The mouth is in the center of the ventral surface, surrounded by seven pairs of legs.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

蛛形（ちゆけい）類と近い関係にある浅海にすむ剣尾目カブトガニ科の節足動物（イラスト）。体は馬蹄（ばてい）形の頭胸甲に覆われた前体部，腹甲で覆われた後体部と剣状の尾部とに分かれており，一見うちわ形に見える。体は光沢のある緑褐色。3体部は境目で互いに関節のようにつながっており，可動。全長60cmくらいになる。頭胸甲の背面には前方中央に小さい単眼2個と，両側の隆起線の後方外側にそれぞれ1個の複眼をもつ。腹面の中央に口があり，それを取り囲んで7対のあしがある。

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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