How do water bugs move in the water? How do water striders walk on water

The larvae of dragonflies are called 'water barbs', and they are not very mobile during this period.

Usually commonly known as 'eating fish tiger', the water barge needs to molt more than a dozen times before it can transform into a dragonfly.

Dragonfly larvae are called water flies (water beggars) The eggs of dragonflies have a special shape when they are first hatched, with six legs and heads shrunk together with the body, like a small shrimp without feet, and they are not very active, which is called the pre-juvenile stage.

This stage is very short.

Three or five seconds, more than two or three minutes, the back of the former larvae will be split, the first instar larvae will molt out soon it will slowly stretch its head and six feet to move freely, dragonfly larvae with different species and different instars, in general, the younger the dragonfly larvae, the lighter its body color, from 8 to 16 instars, the time required for the whole larvae varies according to different species and seasons, from one month to.

There have been three or four years, and so far the dragonfly larvae in Taiwan are all aquatic insects, and no terrestrial species have been found.

In addition to the six legs that can crawl, the water absorbed in the abdomen will be sprayed backwards in an emergency, and the force generated will drive them to move forward quickly to avoid enemies or prey.

In order to avoid predators and prey, the body color of the water fly is very close to the environment, forming a protective color. Stream-dwelling dragonfly larvae [e.g., damselfly larvae] feed mainly on dipteran larvae such as mayfly larvae, rockfly larvae, midges and some small fish, while species that inhabit still waters (e.g., dragonfly larvae) mainly feed on diptera, small shrimp, small fish, daphnia, smaller dragonfly larvae, backstroke piles, staggers, midgels and other dipteran larvae. The natural enemies of larvals are birds, large omnivorous fish, red flowers, posits, dragon lice, etc.

Biological characteristics: A dragonfly spends 95% of its life in water, and the larvae of the dragonfly are called water flies. Since the visceral wall is not able to breathe in water, its breathing rate in water is also much faster. So it can only molt and feather.

It's always in the water, and it's going to move slowly, you can just look at it with a magnifying glass.

Rows of non-watery hairs grow on the joints of the water strider, so the part of the water that comes into contact with the foot will be concave, but the tips of the foot will not break through the surface tension. The water strider has three pairs of legs, and the division of labor between the three pairs of legs is also very clear, the forefoot is used to hunt, the middle foot is used to divide and jump, and the hindfoot is used to glide on the surface of the water, so that it can move freely on the water.

However, if you add a little neutral detergent to the water, it will weaken the surface tension of the water, at this time, the hair on the feet of the water strider walking on the surface of the water is wet, and the foot breaks through the surface tension and penetrates into the water, the water strider will sink into the water, and when the water strider sinks, due to the effect of surface tension, the water strider will no longer float.

The small aquatic insect water strider is known as the "skater in the pond" because it not only glides on the water, but also jumps and plays gracefully on the surface like an ice skater. Its brilliance is that it neither cuts through the water nor soaks its own legs. Water striders are not only harmless to humans, but can hunt and kill insects or become bait for fish.