dragonfly


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dragonfly,

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.

dragonfly

[′drag·ən‚flī]
(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.

dragonfly

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 green darner is the only species of migratory dragonfly whose life history has received much attention.
TTP Labtech will be presenting live demos of dragonfly discovery at SLAS 2018 from 3rd to 7th February 2018, in San Diego, CA, Booth #1219
The US and Turkey were also among the countries targeted by Dragonfly in its earlier campaign, though the focus on organisations in Turkey does appear to have increased dramatically in this more recent campaign, it said.
Specifically designed to accommodate homes, dorm rooms, small offices and cabins, DragonFly Security System cameras mount inside or out and provide the user with the ability to set notification alerts, stream and view real-time video, or request snapshots of camera input.
It means that Dragonfly 44 has a huge amount of unseen mass," said co-author Roberto Abraham of the University of Toronto.
The researchers measured the velocities of stars in Dragonfly 44 using data from Keck over six nights.
Visit the Migratory Dragonfly Partnership website for more information.
Fish and Wildlife Service, Hine's emerald dragonfly restoration and recovery efforts are led by the Chicago Ecological Services Field Office in close partnership with the University of South Dakota.
DF said it will work in partnership with BC Fintech Sdn Bhd, a Dragonfly system integrator, to implement the payment and settlement solution, which will drive the entire remittance chain, from wholesale foreign exchange to the receipt of fiat money at the recipient's end.
At Mobile World Congress 2016, CEVA will demonstrate the Dragonfly reference platform running LTE Cat-0 and GPS concurrently on its silicon-based development platform together with test and measurement equipment from Keysight Technologies and a GNSS Simulator from Galileo Satellite Navigation.
The Dragonfly Club" is a short, inspirational chapter story about an unlikely friendship between two fourth-grade girls, Grace and Tillie, that blossoms into the Dragonfly Club, whose rhyming motto is: "The Dragonfly Club will help those in need, always succeed, and be forever friends with no need to bleed.
Called Dragonfly, the program is designed to enable larger and more powerful satellites that cannot be launched fully assembled, to be packaged in pieces within a standard launch vehicle fairing.