The Chinese name is Eriocheir sinensis, which belongs to the genus Eriocheir in the order Decapoda of the phylum Arthropoda of the animal kingdom. It is a marine organism. Crabs are distributed in North Korea, Japan and Chinese Mainland in Guangdong, Fujian, Zhejiang, Jiangsu, Shandong, Bohai Bay, Liaodong Bay, Taiwan Island and other places. Their living environment is sea water, and they are commonly found under rocks or in rock crevices on the seashore, and sometimes on estuarine mudflats. The head and chest armor are square in shape, with the front half slightly wider than the back half, and the surface has fine concave points. There are particles in all areas of the front and back of the body, and the liver area is low concave. The front and side stomach areas are raised and separated by a longitudinal groove.

Pilumnus vespertilio, also known as bat hairy crab, is an animal belonging to the genus of hairy crabs in the family of hairy crabs. They mainly live in seawater, especially in the crevices of rocks along the coast or in shallow waters of coral reefs. It is distributed in Japan, Hawaii, Australia, Thailand, Singapore, the Indian Ocean, the Red Sea, the east and south coast of Africa, as well as the Xisha Islands and Hainan Island in Chinese Mainland. The back of the body is densely covered with soil brown bristles of varying lengths, with longer bristles distributed along the edges of the head and chest armor and the surface of the feet.