The growth process of dragonflies

The growth process of dragonflies is shown in the figure.

Odonata is a semi-metamorphosed insect, which has only three stages in its life: egg, larva and adult. Adults often lay eggs in water by skimming. Larvae, also known as hydra, preys on other aquatic organisms in the water, climbs out of the water before emergence, mates and lays eggs, and completes its life history.

Dragonflies prey on flies, mosquitoes, leafhoppers, grubs, butterflies and other pests in agriculture, forestry and animal husbandry. Dragonfly is an important natural enemy insect beneficial to human beings. Dragonflies like wet environment, so they usually fly in ponds or rivers, and their larvae (larvae) also need to develop in water.

Dragonflies not only prey on other insects, but also have the habit of adults eating each other among species. When they prey, they will catch their prey fiercely, and there are a lot of coarse hairs on their feet, which can help them catch their prey and make it impossible to escape. The mouth is also quite developed, it can bite prey, facilitate eating, and can eat up food equivalent to its own weight within 30 minutes.

Extended data:

Hydra is generally dark brown or dark green in color, similar in appearance to its adult, wingless and asexual. Lurking at the bottom of mud or under broken branches and leaves, it eats meat fiercely. He likes to prey on small aquatic insects and its larvae, large hydra, and even small fish and tadpoles.

The cycle of hydra varies from species to species, the shortest is about 2-3 months, the common species takes about 1-3 years, and the longest takes 7-8 years to fully mature, during which it takes about 8- 14 times to shed its skin, and then it climbs out of the water to become an adult dragonfly.

A dragonfly spends 95% of its life in water, and its larvae are called hydra. Because the visceral wall can't breathe in water, its breathing frequency in water is also much faster. So I can only shed my skin and hair.

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