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.

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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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Thursley National Nature Reserve is a RAMSAR site of international importance for wetland wildlife, and has long been known as a haven for these beautiful insects, with 26 species of dragonfly and damselflies recorded on site.
As water levels dropped, the density of dragonfly larvae in crayfish burrows showed much lower fluctuations than those in a stream channel.
"After spending two years in the pond it was a marvel of creation that the nymph turned into this beautiful dragonfly. It spent all day drying off before flying off."
The dragonfly lander could prove to be a powerful tool to learn more about Saturn's moon since it can maneuver Titan's volatile atmosphere.
Dragonfly was selected as part of the agency's New Frontiers program, which includes the New Horizons mission to Pluto and the Kuiper Belt, Juno to Jupiter, and OSIRIS-REx to the asteroid Bennu.
Dragonfly Readers are included as interactive eBooks within the Oxford Reading Buddy platform.
Information regarding Google`s "Dragonfly" project began surfacing in August and since then the company has faced severe backlash from its employees as well as the US government.
The Dragonfly G2 system achieves significant throughput and productivity increases using proprietary camera technology combined with stage speed and accuracy.
Written by two of Britain's foremost dragonfly experts, this fully revised and updated fourth edition features hundreds of stunning images and identification charts covering all 57 resident, migrant and former breeding species, and six potential vagrants.
Large Tortoiseshell butterfly and Yellowspotted Emerald dragonfly have been spotted in the UK in recent weeks, while Lesser Emperor dragonfly has been seen as far north as Yorkshire.
They have created a new form of highly efficient low-cost insulation based on the wings of a dragonfly.