Tian Fu (Negative) stink bug, also known as Tian Fu (Negative) stink bug, is a member of the family Nematophoridae in the order Hemiptera. It is a type of aquatic insect that is easily confused with species such as the stink bug and scorpion bug. The field turtle does not lay eggs and directly lays them on the stems of aquatic plants. The stink bug is about 2 centimeters long, while the field turtle can grow up to 12 centimeters. The common individual in China is 7 to 9 centimeters long, with smaller individuals only about 5 centimeters long. It is a widely distributed insect in China. It has a small head, a flat and wide body, lives in water, and its breathing tube is at the end of its abdomen. It feeds on small fish and insects in the water and is fierce in nature.