House flies are from the taxonomical order D iptera meaning two-winged, whereas the four-winged dragonflies and damselflies are from the order Odanata so the two would not be considered closely related. Also, the dragonflies are predators and have mouth parts adapted for preying on other insects. House flies are not able to do this There are many other differences despite the fact the two-winged flies are considered by some to have evolved from the four-winged variety.
After reading this compilation of interesting dragonfly facts ... you'll know a lot. Despite their name, dragonflies are not related to common flies. In fact, they are part of an entirely different order of insects.
Dragonflies are part of the Odonata order, which also includes damselflies. Worldwide, the Odonata order of insects (dragonflies and damselflies) includes more than 5,000 individual species. They exist in many countries around the world.
Within the United States, there are about 400 species of Odonata. You often see dragonflies near bodies of water (ponds, lakes and slow-moving streams) because they lay their eggs on or near the water. Dragonfly young (nymphs) have a special appendage on their head that they use as a spear to catch small fish.
They are predatory insects from birth. Dragonflies are not born with wings. They are born in a larvae state and eventually go through a partial metamorphosis process, during which they grow their wings.
Dragonflies spend most of their lives in the larva stage (up to three years, depending on the species). The adult, winged stage only lasts a few weeks. Mating is the primary reason for their winged stage.
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