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What insects were first attracted by the special smell produced by animal carcasses?
The special smell produced by the corpse will first attract insects of Diptera Calliphoridae, and they are extremely sensitive to this smell.

They will arrive in a few hours at most and lay eggs on the body. The eggs hatched into larvae in 65438 0 ~ 2 days. After 6~ 10 days, the larvae climbed to a distant place nearby and became adults in about 6 days.

Introduction:

Olfactory receptors are mostly distributed on the antennae and tentacles of insects. The shape and size of olfactory receptors of different insects are very different, and the distribution and quantity are also very different.

Olfactory sensors can be divided into three types according to their shapes: hairy sensors, conical sensors and cavity conical sensors. The hairy sensilla and conical sensilla on the antenna of insects mainly feel the chemical odor in the environment. The odor enters the lymph of the sensor through the micropores on the sensor, combines with the odor-binding protein in the lymph to form an odor-OBP complex, and then interacts with the dendritic membrane of the recipient cell to generate an action potential. Action potential signals are introduced into the central nervous system of insects through axons, causing behavioral responses of insects.