have 21 subfamilies and 283 genera (the mainstream classification system is 16 subfamilies. Compared with the system of 21 subfamilies, the new system divides several subfamilies from ponerine). Generally, the body is small, with black, brown, yellow, red, etc. the body wall is elastic, smooth or hairy. The mouth is chewy, and the upper jaw is developed. The antennae are knee shaped, with long stalk segments, 2-3 enlarged ends, and the whole antennae are divided into 4-13 segments. The abdomen is knot shaped. It has wings or no wings. The distance of the forefoot is large, comb shaped, and it is a horn cleaner (for cleaning tentacles).

The external form of ants is divided into three parts: head, chest and abdomen, with six legs. Ant eggs are about 0.5 mm long, irregular oval, milky white, and the larvae are vermicular and translucent. Worker ants are small, about 2.8 mm long, and brown all over. It is easy to find a single ant only when you look closely. Both male and female ants are relatively bulky. The abdomen is fat, and the head and chest are brownish yellow. The front half of the abdomen is brownish yellow, and the back half is brownish brown. The male ant is about 5.5 mm long. The female ant is about 6.2 mm long. The common ants in the indoor environment are small yellow ant and so on.