Golden line crab - Matuta lunaris

Japanese: キンセンガニ(金線蟹) - キンセンガニ（英語表記）Matuta lunaris

A crab of the family Carappa (Crustacea) that lives on the sandy bottom of coastal waters (illustration). The shell is 4 cm wide. The outline of the shell is almost circular, with one protrusion in the center of the side edge. The surface of the shell is almost flat, with six small protrusions arranged symmetrically on both sides. All of the walking legs are flat and all have different shapes. They use these skillfully to swim quickly near the sandy bottom, and when they stop, they quickly burrow into the sand. The shell is a dull gray-white color with many small russet-colored dots on the surface, which provides a clear camouflage effect on the sand.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

沿岸の砂底にすむ甲殻綱カラッパ科のカニ（イラスト）。甲幅4cm。甲の輪郭はほぼ円形で，側縁の中央部に1本の突起がある。甲面はほとんど平らで，6個の小さな突起が左右相称に並んでいる。歩脚はすべて平らで，すべて形が異なる。これらを巧みに使って砂底近くをすばやく泳ぐほか，とまった場所でたちまち砂に潜ってしまう。じみな灰白色で，甲面にあずき色の小点が多数あるが，これは砂上では明らかなカムフラージュ効果を発揮する。

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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