The flower crab is named after its patterned shell. Sometimes it is also called blue crab, which belongs to the genus Portunus, but it is also called red crab because of regional differences. Eriocheir sinensis is a warm-water crab, which is mainly distributed in coastal areas such as Zhejiang, Fujian, Taiwan Province, Guangdong, Guangxi and Hainan Island in China. morphological character

The head breastplate of Portunus ocellatus is about twice as wide as its length. There are coarse particles on the spindle surface, and the female particles are more prominent than the male particles. There are four teeth on the forehead and a pair of short and small incisors in the middle. The adults are sharp and the larvae are dull. There are nine-pointed teeth on the front side edge, and the rear teeth are much larger than the front teeth and protrude to both sides. Claw feet vary in size and length, and male claw feet are about four times as long as head and breastplate, with patterns on the surface.