The big eyed crab is an animal of the genus big eyed crab in the family Crabaidae. It is distributed in the west coast of Korea, Singapore, Australia, Taiwan Island, as well as Hainan Island, Fujian, Zhejiang, Shandong, Bohai Bay, Liaodong Bay, Liaodong Peninsula and other places in Chinese Mainland. The living environment is seawater, and it is often found in the intertidal zone near the coast or on muddy beaches at river mouths. The living environment is seawater, and it is often found in the intertidal zone near the coast or on muddy beaches at river mouths. The width of the head and chest armor is about 1.5 times its length, with surface particles and soft fur, especially dense in males.

The Japanese big eyed crab, also known as the Japanese big eyed crab in Chinese, is an animal belonging to the sand crab family and the big eyed crab genus. It is distributed in Japan, the west coast of Korea, Singapore, Australia, Taiwan Island, as well as Hainan Island, Fujian, Zhejiang, Shandong, Bohai Bay, Liaodong Bay, Liaodong Peninsula and other places in Chinese Mainland. Japanese big eyed crabs often nest on muddy beaches in the intertidal zone or river mouths near the coast. The width of the head and chest armor of the Japanese big eyed crab is about 1.5 times its length, with surface particles and soft fur, especially dense in males. The stomach area is slightly heart-shaped. The heart and intestinal regions are connected in a "T" shape, and there are two parallel transverse shallow grooves in the gill region. The forehead is very narrow, slightly curved downwards, and there is a longitudinal mark in the middle of the surface.

Macrophthalmus banzai (scientific name: Macrophthalmus banzai) is an animal belonging to the genus Macrophthalmus in the family Macrophthalmidae of the sand crab superfamily. The eye sockets are long, the eye stalks are slender, the palms are long, and the two directions are bent downwards. The fingertips are spoon shaped, and the whole body is earthy brown, but the color of the sting is relatively light. When hidden in water, the slender eyes stand upright and protrude from the water surface, and male big eyed crabs have the habit of swinging their double stings, so they are also known as "long live big eyed crabs". Distributed in Japan, Taiwan, China, Hong Kong and Shandong