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Stages of the Blowfly
Transcript of Stages of the Blowfly
The blowfly has seven stages of life, the egg, Larva 1, Larva 2, Larva 3, Pre-pupa, Early and Late pupa, and Adult. These insects are usually the first to a corpse and lay eggs on the decaying body.
Early and Late Puppa
In the egg stage, there is usually a stack of white ovals all clumped in one area. Typically there are over 100 eggs laid at one time. Usually the eggs are in a moist environment such as the mouth, ears, and eyes of a corpse. At this point the corpse is stiff with rigor mortis and livor mortis is complete. During this phase blowfly eggs do not typically move from where they were laid and are not searching for food.
In this stage you are able to see a black mouth. The body is thin and there is one spiracle slit near the anus. The environment at this stage is the location where the eggs were hatched and the food source is the body. At this point the body is in initial decay with appearing normal on the outside but the inside breaking down. At this point the larva will not be traveling.
In the Larva 2 stage, the black mouth hooks and you are able to see black on the dorsal side of the larva. There are now two spiracle slits on the body. The environment is the same as the eggs staying mainly in the same area. The body still appears normal with the body breaking down inside. The food source continues to be the decaying body. The larva still does not leave the body at this stage.
At the final larva stage, the black mouth hooks and the crop is not visible. The larva is covered in fat and there are now three spiracle slits in the body. The larva stays on the body and continues to feed off of it. The larva is still on the body which now has blistering skin and is beginning to swell due to gases inside of the body.
During the pre-pupa stage the pre-pupa has an oval shape with slits fully developed. The larva leaves the body at this point to move to a dry land area and prepare to turn into a pupa. The food source is the body before the larva leaves for dry land.
The pupa has a dark color as it is enclosed in a case. The case enclosing the pupa is filled with air that will split open when the adult emerges. There is no feeding or movement during this stage. The pupa remains buried in the dry environment.
At this final stage of life the blowfly has wings, eyes, and a body. The environment will vary because after the first few hours of being an adult the blowfly has the ability to fly and travel to various locations. The food source at this point of life contains a variety of organisms. The blowfly will travel to another corpse to lay their young.
By Justine DiPasquale