The wing possesses a system of ridges or veins which provide support. They also serve as the paths for air and blood circulation during the development of the wing before the fly emerges from the puparium.
The wing veins are assigned names and numbers for use in describing and identifying different species of flies.
The area between adjacent veins is called a cell.
The house fly venation is fairly distinctive and an important character to use (along with others) to identify the species (Fig 16A-F).
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