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?Moths
Emperor Gum Moth, Opodiphthera eucalypti
Emperor Gum Moth, Opodiphthera eucalypti
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
For other uses, see Moths

A moth is an insect closely related to the butterfly. Both are of the order Lepidoptera. The differences between butterflies and moths is more than just taxonomy. Sometimes the names "Rhopalocera" (butterflies) and "Heterocera" (moths) are used to formalize the popular distinction. Many attempts have been made to subdivide the Lepidoptera into groups such as the Microlepidoptera and Macrolepidoptera, Frenatae and Jugatae, or Monotrysia and Ditrysia. Failure of these names to persist in modern classifications is due to the fact none of them represents a pair of "monophyletic groups". The reality is that butterflies are a small group that arose from within the "moths"[How to reference and link to summary or text] and there is thus no way to group all of the remaining taxa in a monophyletic group, as it will always exclude that one descendant lineage.

Most species of moth are nocturnal (which means they are active at night), but there are crepuscular and diurnal species. They can be distinguished from butterflies in several ways.

Etymology

The Modern English word "moth" comes from Old English "moððe" (cf. Northumbrian "mohðe") from Common Germanic (compare Old Norse "motti", Dutch "Mot" and German "Motte" all meaning "moth"), perhaps its origins are related to Old English "maða" meaning "maggot" or from the root of "midge" which until the 16th century was used mostly to indicate the larva, usually in reference to devouring clothes.

The study of butterflies and moths is known as lepidoptery, and biologists that specialise in either are called lepidopterists. As a pastime, watching butterflies and moths is known as butterflying and mothing. Moths are albino butterflys. The latter has given rise to the term "mother" for someone who engages in this activity — sometimes written with a hyphen (moth-er) to distinguish it from its usual meaning. This confusion does not arise in speech as it is pronounced differently (IPA: /ˈmɒθɚ/, not /ˈmʌðɚ/).

Economic significance of moths

File:Poplar hawk-moth.jpg

Moths, and particularly their caterpillars, are a major agricultural pest in many parts of the world. The caterpillar of the gypsy moth (Lymantria dispar) causes severe damage to forests in the northeast United States, where it is an invasive species. In temperate climates, the codling moth causes extensive damage, especially to fruit farms. In tropical and subtropical climates, the diamondback moth (Plutella xylostella) is perhaps the most serious pest of brassicaceous crops.

Several moths in the family Tineidae are commonly regarded as pests because their larvae eat fabric such as clothes and blankets made from natural proteinaceous fibers such as wool or silk. They are less likely to eat mixed materials containing artificial fibers. There are some reports that they can be repelled by the scent of wood from juniper and cedar, by lavender, or by other natural oils. However, many consider this unlikely to prevent infestation. Naphthalene (the chemical used in mothballs) is considered more effective, but there are concerns over its effects on human health. Moth larvae may be killed by freezing the items which they infest for several days at a temperature below −8 °C (18 °F). [1]

Moths are sturdy and usually are more resistant to pesticides than are mosquitoes and flies.

Some moths are farmed. The most notable of these is the silkworm, the larva of the domesticated moth Bombyx mori. It is farmed for the silk with which it builds its cocoon. The silk industry produces over 130 million kilograms of raw silk, worth about 250 million U.S. dollars, each year. Not all silk is produced by Bombyx mori. There are several species of Saturniidae that are also farmed for their silk, such as the Ailanthus moth (Samia cynthia group of species), the Chinese Oak Silkmoth (Antheraea pernyi), the Assam Silkmoth (Antheraea assamensis), and the Japanese Silk Moth (Antheraea yamamai).

The mopane worm, the caterpillar of Gonimbrasia belina, from the family Saturniidae, is a significant food resource in southern Africa.

Despite being framed for eating clothing, most moth adults do not eat at all. Most like the Luna, Polyphemus, Atlas, Prometheus, Cercropia, and other large moths don't have mouths. When they do eat, moths will drink nectar. Only one species of moth eat wool [How to reference and link to summary or text]. The adults do not eat but the larvae will eat through wool clothing.

Attraction to light

File:Moths attracted by floodlight.jpg

Moths frequently appear to circle artificial lights. One hypothesis advanced to explain this behavior is that moths use a technique of celestial navigation called transverse orientation. By maintaining a constant angular relationship to a bright celestial light, such as the Moon, they can fly in a straight line. Celestial objects are so far away, that even after travelling great distances, the change in angle between the moth and the light source is negligible; further, the moon will always be in the upper part of the visual field or on the horizon. Human light sources have not existed long enough to affect the evolution of moth navigation systems. When a moth encounters a much closer artificial light and uses it for navigation, the angle changes noticeably after only a short distance, in addition to being often below the horizon. The moth instinctively attempts to correct by turning toward the light, causing airborne moths to come plummeting downwards, and - at close range - which results in a spiral flight path that gets closer and closer to the light source. [1]

In 1972, Henry Hsiao, now a professor of biomedical engineering, suggested that the reason for moths circling lights may have to do with a visual distortion called a Mach band [2]. He says that they fly towards the darkest part of the sky in pursuit of safety and are thus inclined to circle ambient objects in the Mach band region. This hypothesis is not scientifically accepted and has never been confirmed.[How to reference and link to summary or text]

Hsaio says that the celestial navigation theory should cause moths to circle lights, not to head directly toward them, as many are seen to do. He conjectures that moths, which are nocturnal creatures, must find a place to hide from predators when daylight comes, but cannot do so in darkness. Their instinct when morning comes is to fly toward the light (presumably up) and then down again, with some probability landing on a surface which matches their camouflage.[1]

A theory which has been advanced in an attempt to explain the attraction male moths have for candles specifically is based on olfaction. There is evidence that olfaction might be, in some cases, mediated by detection of the infra-red spectra of substances [3]. The spiky infrared spectra of a candle flame happens to contain a number of emission lines which coincide with the vibrational frequencies of the female moth's pheromone [4]. The male moth is thereby powerfully attracted to the flame. Sources, eg. hurricane lamps, with different spike patterns are less powerful attractants.


Notable moths

Moths of economic significance:

See also

Gallery

References

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External links

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References

  1. 1.0 1.1 Why are Moths Attracted to Flame? (audio) All Things Considered, August 18, 2007.
  2. Henry S. Hsiao, Attraction of moths to light and to infrared radiation. San Francisco Press (1972) ISBN 0-911302-21-2
  3. Wright, R. H., The Sense of Smell. CRC Press, London (1982)
  4. Callahan, P.S., Moth and candle, Applied Optics 12, 3089-3097
  5. Tait, Malcolm (2006-08-28). "1" Animal Tragic: Popular Misconceptions of Wildlife Through the Centuries, 38, Think Books. URL accessed 2008-02-19.
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