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any insectinsect,
invertebrate animal of the class Insecta of the phylum Arthropoda. Like other arthropods, an insect has a hard outer covering, or exoskeleton, a segmented body, and jointed legs. Adult insects typically have wings and are the only flying invertebrates.
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 of the order Odonata, which also includes the damselfly. Members of this order are generally large predatory insects and characteristically have chewing mouthparts and four membranous, net-veined wings; they undergo complete metamorphosismetamorphosis
[Gr.,=transformation], in zoology, term used to describe a form of development from egg to adult in which there is a series of distinct stages. Many insects, amphibians, mollusks, crustaceans, and fishes undergo metamorphosis, which may involve a change in habitat,
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. Species are found throughout the world except in the polar regions; the greatest variety occurs in the tropics.

Dragonflies, which are commonly called horse stingers and devil's darning needles, are strong fliers with elongated bodies; they rest with their wings outstretched. Some are 5 in. (12.7 cm) long. Damselflies are generally smaller, with slender, often brilliantly colored, bodies and rest with their wings folded back. The giant helicopter damselfly of tropical America has a wingspan of 7.5 in. (19 cm).

Both dragonflies and damselflies lay eggs on or near water. The nymphs are aquatic and breathe by means of gills located at the end of the abdomen; the gills can also be used for propulsion through the water. The nymphs feed on insect larvae and are an important food for fish and birds. When grown, they crawl up out of the water and molt. Most species produce a single generation each year, with the nymph stage usually overwintering. Both nymphs and adults prey on mosquitoes and other insects and are harmless, indeed beneficial, to humans.

Fossil remains of a form from the Permian period, with a wingspread of 2 1-2 ft (76 cm), have been found. Modern dragonflies and damselflies are classified in the phylum ArthropodaArthropoda
[Gr.,=jointed feet], largest and most diverse animal phylum. The arthropods include crustaceans, insects, centipedes, millipedes, spiders, scorpions, and the extinct trilobites.
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, class Insecta, order Odonata.


(invertebrate zoology)
Any of the insects composing six families of the suborder Anisoptera and having four large, membranous wings and compound eyes that provide keen vision.


1. any predatory insect of the suborder Anisoptera, having a large head and eyes, a long slender body, two pairs of iridescent wings that are outspread at rest, and aquatic larvae: order Odonata
2. any other insect of the order Odonata
References in periodicals archive ?
The finding that variations in larval density were insignificant in the control tanks during the period of experiment rules out the possibility that other factors influenced the reduction and confirms the role of the dragonfly nymph as an effective predator that decreases larval-mosquito density in treated tanks.
Translated, the Athol Bird and Nature Club, the Dragonfly Society of the Americas and the Millers River Environmental Center are sponsoring a weekend of study and talks about dragonfly nymphs.
The rest are eaten by water beetles, fish, and dragonfly nymphs.
This involves wading into the streams and counting living samples like dragonfly nymphs and crayfish.
They agreed the macroinvertebrates such as crayfish, leeches and dragonfly nymphs, and vertebrates such as minnows, frogs and salamanders would be most likely to interest the bass.
suggests visiting a variety of habitats, lakes, rivers, marshes, bogs and ponds, where dragonfly nymphs are easiest to observe.
Bloodworm, GRHE, Damsel and Dragonfly nymphs did well subsurface.
Small Heath School pupils learned about river ecology at RSPB's Middleton Lakes, near Tamworth, as they launched their Lifelong Learning Programme The Year 11 children swopped course books and computers for sampling nets used for finding snails, may-fly larvae and dragonfly nymphs in Langley Brook.
London, June 29 (ANI): A team of scientists has claimed to have solved the curious case of the missing legs in many frogs, by suggesting that the deformed frogs are actually victims of the predatory habits of dragonfly nymphs, which eat the legs of tadpoles.
There is something different to see every day, birds courting and nest building, shelducks strutting on high obstacles, flamingos making nests from mud with their beaks, wetland plants beginning to bloom, dragonfly nymphs appearing, songbirds singing loud and clear and many other natural spectacles.
Both damselfly and dragonfly nymphs feed on small aquatic organisms, fish, and tadpoles (Corbet 1999, Colburn 2004), while adults feed on mosquitoes, butterflies, and other winged insects associated with vegetation of aquatic habitats.