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Photographer's Note

Fly is the common name for insects of the order Diptera, or true flies, which includes the small HOUSE FLY, FRUIT FLY, GNAT, MOSQUITO, MIDGE, BLOWFLY, and BOTFLY, and the nearly 2.5-cm-long (1-in) crane fly, DEERFLY and HORSEFLY. Many flies are either harmful as carriers of disease or nuisances because they are voracious biters or bloodsuckers. Some, such as the fruit fly, have been used extensively for laboratory studies of genetics, because they breed rapidly and their large chromosomes are easily seen under the microscope.
The term fly is applied to such non-Diptera as the butterfly, dragonfly, mayfly, and stone fly. Unlike these and other insects, true flies have a single pair of membranous forewings, with knob-shaped vestigial wings instead of hind wings. The vestigial wings are called halteres and are used as balancing organs.
The mouthparts are specialized for lapping or sucking in some flies and for piercing and sucking in others. Almost all species have antennae and large compound eyes. A network of thick veins strengthens the wings; the pattern of these venations is used for identification and classification. One theory is that the veins evolved from tracheae, a system of tubes common in insects that supplies oxygen to the tissues.
All flies develop through metamorphosis in four stages: egg, larva, pupa, and adult. The larvae, commonly called maggots, lack eyes, legs, wings, antennae, and distinct mouthparts and body regions. To accomplish its transformation to the adult, larval muscle and other tissues are broken down into a creamy fluid and resynthesized into the adult structures. The pupa is defenseless but generally escapes predators because it is dark brown and buried in soil or heaps of waste.

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Photo Information
  • Copyright: paolo ardiani (pione) Gold Star Critiquer/Gold Note Writer [C: 214 W: 4 N: 244] (2031)
  • Genre: Lieux
  • Medium: Couleur
  • Date Taken: 2005-05-00
  • Categories: Nature
  • Exposition: f/3.2, 1/650 secondes
  • More Photo Info: view
  • Versions: version originale
  • Date Submitted: 2005-08-05 8:55
  • Favoris: 2 [voir]
Viewed: 1831
Points: 28
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