Abıut Mosquito

1. MOSQUITOES
Identification:
Mosquitoes have long , 14-15
segmented antennae ,an
elongated proboscis
consisting of a bundle of
stylets loosely encased in a
sheath formed by the
labium , and fringes of
scales on the wings.

2. MOSQUITOES
These anatomical details
are sufficient taxonomic
characters to reliably
distuinguish the taxon
that we recognize as
mosquitoes from other
insects with which they
might be confused.

3. Life Cycle of Mosquitoes
 Mosquitoes lay their eggs on water or in dry
places that tend to flood seasonly.
 Eggs laid on water hatch in less than a week.
 Larvae are air breathers and die within hours if
their air supply is shut of by an oil film on the
waters’s surface.
 The larvae molt four times , usually within the
space of two weeks , and then pupate.
 As is characteristic of all nematocerans and
brachycerans , the pupa emerges through a
T-shaped hole in the back of the last larval skin.

4. Life Cycle of Mosquitoes
 Culicid pupae are elaborate , free-swimming
organisms with a large cephalothorax.
 The pupal stage ordiranily lasts from two days to a
week , but a few hours suffice for certain dry
climate species.
 The adult mosquito emerges through a hole in the
back of the pupal case as it floats at the water’s
surface.
 After about 24 hours the wings have expanded
and hardened and the mosquito is able to fly.

5. Life Cycle of Mosquitoes
 Only female mosquitoes suck blood , the protein
of which is necessary for the maturation of the
ovaries.
 Males and nonreproductive females get by on
nectar and plant juices.
 Mammals and birds are preferred hosts both of
blood-feeding mosquitoes and of the various
disease organisms that they transmit.

8. INJURY
 Under ordinary circumstances amount of blood
lost to mosquito attack is entirely trivial.
 Sometimes however circumstances favor the
simultaneous emergence of enormous swarms of
mosquitoes that by their concerted attacks can
actually bleed cattle to death.

9. Disease Transmission
 A vector is an animal , often an arthropod that
transmits an infective organism from one host to
another.
 A vector that transmits infective organisms directly
to a recipient host without development or
multiplication of the organisms having occured is
called a mechanical vector.
 A biological vector , by contrast , is one in which
the infective organisms either undergo
development or multiply or do both before being
transmitted to the recipient host.
 Thus a biological vector is a true host of the
disease organism.

10. Disease Transmission
 Mosquitoes also seve as biological vectors of viral
encephalitides .