The evolution of dragonflies:

1. Dragonfly larvae are called hydra (water beggar):

Their body color is generally dark brown or dark green, and their appearance is similar to that of their adults, with no wings and no sexual maturity. Lurking at the bottom of the mud or under the broken branches and leaves, he is carnivorous and fierce. He likes to prey on small aquatic insects and their larvae, large hydra, and even small fish and tadpoles.

the period of hydra varies with different species, ranging from 2-3 months for short, 1-3 years for common species, and 7-8 years for the longest, during which it takes about 8-14 times of peeling, and then it climbs out of the water to become an adult dragonfly.

2. Dragonfly larva:

Dragonfly larva is the floorboard of Odonata larva. Widely distributed all over the world, in fresh water in warm areas. Belongs to an incomplete pervert. Dragonflies overwinter as larvae.

the larva body is divided into head, chest and abdomen. The head and chest are healed and can't move. The mouthparts have a special structure, and the lower lip is covered, which can stretch and contract, and is used to catch food. The tail has three tail leaves, which can breathe oxygen dissolved in water. Generally, I like to live in clear water with many aquatic plants.

3. Adult stage (emergence) of dragonfly:?

Generally, it is large in size, with long and narrow wings, clear membranous and reticulate veins. Vision is extremely sensitive, with 3 eyes; Antennas 1 pair, thin and short; Chewing mouthparts. The abdomen is slender, flat or cylindrical, with anal appendages at the end. The feet are thin and weak, and there are hooks and thorns on them, which can catch pests when flying in the air.

The eclosion adults have different colors, ranging from metallic color to pink color. Compared with other insects, it is huge, with some wingspans reaching 16 cm (about 6 inches), and even the smallest species has a wingspan of 2 cm (.8 inches). Besides being extremely agile flying animals, they are also one of the fastest insects.

Dragonfly wing muscles can function best when it is warm, but if it is cool, this insect often flaps its wings to generate heat before taking off. Dragonfly's speed and agility make it the most efficient flying predator. The prey is usually flying bugs, but some dragonflies often eat 6% of their own weight.

Baidu Encyclopedia-Hydra

Baidu Encyclopedia-Dragonfly

Baidu Encyclopedia-Dragonfly