蜻蜒的特性!!試就入來答!!

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蜻蜒:dragonfly
A dragonfly is a type of insect belonging to the order Odonata, the suborder Epiprocta or, in the strict sense, the infraorder Anisoptera. It is characterized by large multifaceted eyes, two pairs of strong transparent wings, and an elongated body. Dragonflies are similar to damselflies, but the adults can be differentiated by the fact that the wings of most dragonflies are held away from, and perpendicular to, the body when at rest.

Dragonflies typically eat mosquitoes, and other small insects like flies, bees, ants and butterflies. They are therefore valued as predators, since they help control populations of harmful insects. Dragonflies are usually found around lakes, ponds, streams and wetlands because their larvae, known as "nymphs", are aquatic. Adult dragonflies do not bite or sting humans, though nymphs are capable of delivering a painful bite.
Damselflies (suborder Zygoptera) are often confused with dragonflies, but these are distinct; most damselflies hold their wings at rest together above the body or held slightly open above (such as in the family Lestidae), whereas most dragonflies at rest hold their wings horizontally or occasionally slightly down and forward. Also, the back wing of the dragonfly broadens near the base, caudal to the connecting point at the body, while the back wing of the damselfly is essentially similar to the front wing. The eyes on a damselfly are apart; in most dragonflies the eyes touch. Notable exceptions to this rule are the Petaluridae (Petaltails) and the Gomphidae (Clubtails

2008-11-05 12:55:37 補充：
Formerly, the Anisoptera were given suborder rank beside the "ancient dragonflies" (Anisozygoptera) which were believed to contain the two living species of the genus Epiophlebia and numerous fossil ones.

2008-11-05 12:55:46 補充：
The artificial grouping Anisozygoptera is disbanded, its members being largely recognized as extinct offshoots at various stages of dragonfly evolution. The two living species formerly placed there — the Asian relict dragonflies — form the infraorder Epiophlebioptera alongside the Anisoptera.

2008-11-05 12:56:00 補充：
More recently it turned out that the "anisozygopterans" form a paraphyletic assemblage of morphologically primitive relatives of the Anisoptera. Thus, the Anisoptera (true dragonflies) are reduced to an infraorder in the new suborder Epiprocta (dragonflies in general).

2008-11-05 12:56:14 補充：
hope this can help you!

Dragonfly (Dragonfly)


Difference wing suborder and bunches of wing suborder of damselfly that can divide into dragonfly, have besides until Japan and only two assign, in one dragonfly,etc. that India find Large-scale insect, the most primitive insect that has in wing subclasses too. The wing is developed, the front and back wing is waited for long and narrow; The head can be rotated flexibly, the feeler is short, the compound eye is developed, have three simple eyes, the chewing type mouthpart is strong and strong. Male worm's mating device lies on two, three webs of belly. Non- holometabolous, the larva " nymph of the dragonfly " Live in water, cover and pray on with the extremely developed face. No matter the adult or larva is carnivorous, eat more pests. Nearly have more than 4500 kinds.


圖片參考：http://imgsrc.baidu.com/baike/pic/item/b25aae513e17b60b367abe07.jpg

蜻蜒的特性!!試就入來答!!