Flat-clawed crab - Ovalipes punctatus

Japanese: ヒラツメガニ(平爪蟹) - ヒラツメガニ（英語表記）Ovalipes punctatus

A decapod crustacean of the family Portunidae (illustration). It is an edible crab with a carapace width of 10 cm, and although it does not produce much meat, it is sometimes caught in large quantities and shipped. Because the outline of the carapace is rounded, it is often called Maru or Kinchakugani among fishermen. The carapace curves front to back and side to side, and the carapace area is unclear except for a deep H-shaped groove in the center of the carapace. It looks like there are four protrusions lined up on the forehead. There are five triangular protrusions on the front edge of the carapace, and the outer edges of all of these are rounded.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

十脚目ワタリガニ科の甲殻類（イラスト）。甲幅10cmの食用ガニで，肉量は多くないが，多量に漁獲されることがあり，出荷される。甲の輪郭が丸みをおびていることから漁業関係者の間ではマルとかキンチャクガニの名で呼ばれることが多い。甲面は前後左右に湾曲し，甲面中央部にH字状の深い溝があるほかは甲域が不明りょう。額に4本の突起が並んでいるように見える。甲の前側縁には三角形の突起が五つあり，それらの外縁はいずれも丸みを帯びている。

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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