CHRYSOMYA MEGACEPHALA PDF

Help Wikipedia improve by adding precise citations! October Learn how and when to remove this template message C. In tropical populations, such as in Brazil , fertility is also lower in areas with high densities of larvae, where many in one small area compete for the same food source. A correlation between wing size and temperature as well as tibia size and temperature has also been found in this species.

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Help Wikipedia improve by adding precise citations! October Learn how and when to remove this template message C. In tropical populations, such as in Brazil , fertility is also lower in areas with high densities of larvae, where many in one small area compete for the same food source. A correlation between wing size and temperature as well as tibia size and temperature has also been found in this species.

There was a similar relationship between wing and tibia size and fecundity. All three of these values variables, fecundity, wing size and tibia size, stay within the same range throughout the year, showing seasonal variation to be absent. This has been of interest to researchers, since this fly is present in high numbers in warm weather and low numbers in cold weather.

The majority of Dipteran species that have had a life table constructed have demonstrated a tendency for smaller bodies in the warmer months. The long adult lifespan means that the parents are present to rear the offspring, ensuring their survival. The developmental stages of C.

A female fly may lay as many as to eggs, often in human feces, meat or fish. These intervals vary depending on geographical location; other environmental factors also can determine how long flies will stay in the larval stage. Males tend to emerge two or three hours ahead of the females. Larval competition[ edit ] C. Research has shown that under specific population densities, C. When C. Both species had a lighter adult weight than normal and pupated earlier. The third instar of C. Despite this predation on Chrysomya megacephala, both species had a lower survival rate, lighter adult weight and pupated early.

In many forensic entomology cases either C. Larval dispersion patterns of C. Knowing that, to pupate, larvae move away from the food source to find a safe place to metamorphose, forensic entomologists can accurately calculate a post mortem interval. If only C. The colonization of C. Organophosphate compounds are used in agriculture and are highly toxic. However, it is somewhat difficult to evaluate the body tissue in a body that is exceedingly decomposed.

Nevertheless, a medical examiner in Hawaii worked on a case in which poisoning by malathion , an organophosphate insecticide, [29] was thought to be the cause of death. The fly larvae of Chrysomya megacephala and Chrysomya rufifacies were also present at the scene on the body and were tested for malathion. Both of these species did contain malathion, but there had been no previous record of organophosphates in their larvae.

Studying larvae from decomposed remains may provide an effective method of determining the presence of these toxins in a body that is extremely decayed.

While most areas wish to rid themselves of C. This causes losses in cattle and fish industries all over the world. Studies are being done on C. Most recorded miasis cases, however, do not involve the fly. In these areas sun-drying is the major method of preserving fish, as ice is typically unaffordable. However, blowfly larvae tend to infect these sun-dried fish when the weather is warm and humid.

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Chrysomya megacephala (Fabricius, 1794)

Genus : Chrysomya Robineau Desvoidy Species : megacephala Fabricius The first- instar larva was described by Sukontason et al. Biology Chrysomya megacephala is one of the most common members of the genus in Australia. It is a large species , often exceeding 10mm in length and is of tropical origin. It has been reported in forensic cases in Thailand, and in other developing countries, and has been responsible for causing myiasis in humans Sukontason et al.

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Thick Setae on the meron Plumose arista Keep in mind, however, that not all species will conform completely to these guidelines. Adults feed on many things including decaying matter, excreta, and flowers. In their six-week lifespan, specific length may differ as a result of temperature, weather, etc. The species Chrysomya bezziana , for example, lay their eggs exclusively on live mammals. And, as with many fly genera primary and secondary myiasis is possible but unlikely. A Chrysomya rufifacies larva The genus Chrysomya contains 12 species, [3] several of which cause primary and secondary myiases of domestic animals.

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