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.

The Jacelin Chou Chao or Jacelin Chao Crab is a type of crab belonging to the sand crab family. They mainly live in seawater, especially in mangrove mudflats. Jia Selin's ugly and trendy head and chest armor is slightly rectangular, with a width of up to 2 centimeters, and the surface is uneven, with obvious H-shaped grooves in the stomach and heart regions. The right leg of a male crab is often larger than its left leg, known as the mating leg, and can even be larger than its body, weighing almost half of its entire body. The head and chest armor of male crabs are gray white to dark brown in color, with unclear patterns and varying body colors. The heart area is often light blue.

The North Pacific snow crab is a member of the Decapoda order of the sand crab family, also known as the pine leaf crab, Tsurugi crab, snow crab, and Far Eastern sea snow crab. It is a type of snow crab originating from the waters surrounding Russia and Japan. Belonging to large crabs that inhabit the deep sea. There are red eyed snow crabs and gray eyed snow crabs.