As shown in the figure, it is edible, and it should be

an arthropod belonging to the genus Grapseus, which belongs to the family Grapsidae

The picture below shows the grapseus albilineatus

The head and breastplate are nearly round, and the two sides are obviously arched. The forehead base is bent downward, and its height is about half of the width between eyes. The color is dark green with white spots and white stripes. It has claws covered with spikes and has the function of nailing shoes. Therefore, it is an expert in climbing coastal rocks or wave-absorbing blocks. Generally, the impact of waves often jumps off the edge of rocks in case of danger, which can be regarded as an expert in jumping.

distributed in Japan, Hawaii, Australia, the Red Sea and the east coast of Africa. Widely distributed in tropical areas of Indian Pacific, Taiwan Province Island, Guangdong, Hainan Island and Xisha Islands in Chinese mainland, the living environment is seawater, and they generally live beside high tide rocks or coral reefs.