蝇虫的种类与危害 Species and harms of flies
Species and harms of flies:
According to biological classification, fly belongs to cyclorrhapha,
diptera, insecta. It has various species, which can be divided into
two major categories: house fly and non-house fly. Sanitation-related
flies are in a small amount. Most frequently seen flies include
housefly, musca sorbens, chrysomyia megacephala, cryptolucilia caesarion
and flesh fly, etc. Flies not only pollute living and working environment
or suck blood (a few species), but also spread pathogens of various
diseases including malaria, typhoid, cholera, poliomyelitis, abscess,
tuberculosis, hepatitis B, etc.
Means of spread:
While sucking excrement and urine of human and livestock, secretion
of nose, pharynx and eyes as well as vomits, it's hairy body surface,
especially tarsi, pulvilli and labella pollute food and household
utensils and thus spread diseases.
The pathogens enter the fly's alimentary canal and were discharged
on people's food with the fly's excrement.
c.是吸血蝇类在吸血过程中造成血液感染。 Blood infection in bloodsucking
②、常见蝇种的区分： How to distinguish common flies：
Housefly: Body in light black. Four vertical lines on
the back. It tops the five common flies in quantity and thus
is most closely related to human. It is a major kind of flies
spreading malaria, typhoid, cholera, poliomyelitis, tuberculosis,
hepatitis B, etc.
Musca sorbens: Also named hill fly, Gray in body. Similar
to housefly in shape, but smaller. There are two vertical
lines on the back. For female flies, the two lines bifurcate
at the front end. It mainly spreads malaria, typhoid, and
Chrysomyia megacephala: Relatively large in size. Eyes
in crimson and body in green with sheen. It is an one of the
important medias for malaria.
Cryptolucilia caesarion: Smaller than Chrysomyia megacephala.
Body in green with sheen and small eyes in crimson. It carries
pathogens of various diseases including malaria, typhoid,
cholera, poliomyelitis, tuberculosis, hepatitis , etc
Flesh fly: Body, long and large. Gray. There three black
vertical lines on the back and chessboard-grid-shaped color
lines on the abdomen. It is an important media spreading malaria
Flies spread various microorganisms and carry worm eggs. Up to
now, 30 species of virus, 100-plus species of bacteria and 30 species
of protozoon have been discovered.
How to distinguish male and female flies: The male fly's parafrontalia
is about the same width with its interfrontali, while the femal's
parafrontalia is about 2/3 of the width of its interfrontali; There
is a bright black or red ball-shaped hypopygium on the rear abdomen
of male flies, but not on female flies.