File:Dragon Fly 3.jpg
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[edit]DescriptionDragon Fly 3.jpg |
A dragonfly is an insect belonging to the order Odonata, infraorder Anisoptera (from Greek ἄνισος anisos, "uneven" and πτερόν pteron, "wing", because the hindwing is broader than the forewing). Adult dragonflies are characterized by large, multifaceted eyes, two pairs of strong, transparent wings, sometimes with coloured patches, and an elongated body. Dragonflies can be mistaken for the related group, damselflies (Zygoptera), which are similar in structure, though usually lighter in build; however, the wings of most dragonflies are held flat and away from the body, while damselflies hold the wings folded at rest, along or above the abdomen. Dragonflies are agile fliers, while damselflies have a weaker, fluttery flight. Many dragonflies have brilliant iridescent or metallic colours produced by structural coloration, making them conspicuous in flight. An adult dragonfly's compound eyes have nearly 24,000 ommatidia each. Dragonfly Temporal range: Jurassic–recent PreЄЄOSDCPTJKPgN Yellow-winged darter Sympetrum flaveolum Scientific classification Kingdom: Animalia Clade: Euarthropoda Class: Insecta Order: Odonata Suborder: Epiprocta Infraorder: Anisoptera Selys, 1854 Families Aeshnoidea Aeshnidae (hawkers or darners) Austropetaliidae Gomphidae (clubtails) Petaluridae (petaltails) Cordulegastroidea Chlorogomphidae Cordulegastridae (spiketails) Neopetaliidae Libelluloidea Corduliidae (emeralds)$ Libellulidae (skimmers, etc) Macromiidae (cruisers) Synthemistidae (tigertails) $Not a clade Fossils of very large dragonfly ancestors in the Protodonata are found from 325 million years ago (Mya) in Upper Carboniferous rocks; these had wingspans up to about 750 mm (30 in). About 3000 species of Anisoptera are in the world today. Most are tropical, with fewer species in temperate regions. Dragonflies are predators, both in their aquatic larval stage, when they are known as nymphs or naiads, and as adults. Several years of their lives are spent as nymphs living in fresh water; the adults may be on the wing for just a few days or weeks. They are fast, agile fliers, sometimes migrating across oceans, and are often found near water. They have a uniquely complex mode of reproduction involving indirect insemination, delayed fertilization, and sperm competition. During mating, the male grasps the female at the back of the head or on the prothorax, and the female curls her abdomen under her body to pick up sperm from the male's secondary genitalia at the front of his abdomen, forming the "heart" or "wheel" posture. Loss of wetland habitat threatens dragonfly populations around the world. Dragonflies are represented in human culture on artifacts such as pottery, rock paintings, and Art Nouveau jewellery. They are used in traditional medicine in Japan and China, and caught for food in Indonesia. They are symbols of courage, strength, and happiness in Japan, but seen as sinister in European folklore. Their bright colours and agile flight are admired in the poetry of Alfred, Lord Tennyson and the prose of H. E. Bates. |
Date | 18 April 2018 (according to Exif data) |
Source | Own work |
Author | FarhanTahir90 |
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current | 15:50, 19 May 2018 | ![]() | 3,968 × 2,240 (2.78 MB) | FarhanTahir90 (talk | contribs) | Uploaded using Commons Mobile App |
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Image title | dav |
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Camera manufacturer | HUAWEI |
Camera model | WAS-LX1A |
Exposure time | 4,161/1,000,000 sec (0.004161) |
F-number | f/2.2 |
ISO speed rating | 50 |
Date and time of data generation | 17:35, 18 April 2018 |
Lens focal length | 3.83 mm |
Width | 3,968 px |
Height | 2,240 px |
Bits per component |
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Orientation | 0 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | WAS-LX1AC185B181 |
File change date and time | 17:35, 18 April 2018 |
Y and C positioning | Centered |
Exposure Program | Normal program |
Exif version | 2.1 |
Date and time of digitizing | 17:35, 18 April 2018 |
Meaning of each component |
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APEX shutter speed | 29.8973 |
APEX aperture | 2.27 |
APEX brightness | 0 |
APEX exposure bias | 0 |
Metering mode | Pattern |
Light source | Daylight |
Flash | Flash did not fire |
DateTime subseconds | 653893 |
DateTimeOriginal subseconds | 653893 |
DateTimeDigitized subseconds | 653893 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Custom process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 98 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |