ENTOMOLOGY - basu.org.in · ENTOMOLOGY DR. R. K . SHARMA Asstt. Professor –cum- Jr. Scientist....
Transcript of ENTOMOLOGY - basu.org.in · ENTOMOLOGY DR. R. K . SHARMA Asstt. Professor –cum- Jr. Scientist....
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ENTOMOLOGY
DR. R. K . SHARMA
Asstt. Professor –cum- Jr. Scientist.
Deptt. of Vety. Parasitology.
Bihar Veterinary College , Patna-14
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ENTOMOLOGYEntomology = Entoma + logos .
Science of insects Insects + Science
All kinds of Arthropods of phylum Arthropoda
Arthros = Jointed . Podos = Foot.
Main characteristics of Arthropoda :-
1. A hard chitinous exoskeleton .
2. A segmented body.
3. A jointed limb .
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Body part of a typical “INSECT”
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MOULTING :
Moulting is formation of new exoskeleton
periodically after casting off the old chitinous
covering during the growth of an arthropod , Each
casting of the exoskeleton is called ‘ Moulting or
Ecdysis,
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ECDYSIS / MOULTING
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ECDYSIS OR MOULTING
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THE INTERNAL ORGAN
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CIRCULATORY SYSTEM
Circulatory system consists of enlarged dorsal
blood vessels , which is enclosed in a compartment
of the haemocoele full of blood called
‘Pericardium’. ‘Ostia’ is opening in its wall .
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THE ORGAN OF CIRCULATION : “HEART”
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RESPIRATORY SYSTEM
Respiratory system is small circular opening in the
exoskeleton called ‘Spiracles’.Which allow air into
the body.
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THE ORGAN OF RESPIRATION
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DIGESTIVE SYSTEM
Digestive system divided into three parts :-
(1)Fore gut or Stomodaeum.
(2) Mid gut or Mesenteron .
(3) Hind gut or Proctodaeum.
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THE ORGAN OF DIGESTION
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EXCRETORY SYSTEM
At the junction of mid gut and hind gut there are
variable number of exretory tubules called as
Malpigian tubules .
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THE ORGAN OF EXCRETION
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REPRODUCTION SYSTEM
Sexes are separate .
Male have a pair of testes , composed of seminal
Vesicle , ejaculatory duct and copulatory organ .
Female have a pair of accessory structures i.e overy
and overoles .
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EXCRETORY SYSTEM
At the junction of mid gut and hind gut there are
variable number of exretory tubules called as
Malpigian tubules .
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THE ORGAN OF REPRODUCTION
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CLASSIFICATIONArthropoda (Phylum)
Subphylum__________________________________________________________
Mandibulata Chelicerata Pentastomida
Class_______________________________________
Insecta Arachinid
Subclass___________________________________
Apterygota Pterygota
Division____________________________________
Endopterygota Exopterygota
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ORDER ORDER
Siphonaptera (Fleas) Orthroptera (Cockroach, Grasshopper)
Diptera(True flies) Pthiraptera (Lice )
Hymenoptera (Bees) (a)Siphunculata’
Coleoptera (Beetles ) Anoplura’(Sucking lice)
Lepidoptera (Butter flies, Moths) (b) Mallophaga(Biting lice)
Neuroptera ( Lace wings) Hemiptera (Bugs)
Odonata (Dragan fly)
Isoptera (Termites)
Diptera
_________________________________________________
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SUBORDER_______________________________________________
Nematocera Brachycera Cyclorrhapha
Family_________________________________Family
Ceratopogonidae (Midge) Musidae(House,Stable Fly )
Simuliidae (Black flies) Calliphoridae (Blow fly)
Psychodidae (Sand fly) Hippoboscidae(Forest kid)
Culicidae (Mosquitoes) Osteridae (Bot fly)
Tabanidae ( Horse flies)
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INSECTA1. Three (3) pairs of legs .
2. Body is divided into 3 parts Head, Thorax, and
Abdomen .
3. Single pair of sensory
antennae .
4.Eyes are absent or reduced
but well developed in blood
sucking .
ARACHINIDA1. Four (4) pairs of legs .
2. Body is divided into 2 parts Cephalothorax &
Abdomen .
3. No antennae .
4. Eyes are absent or reduced .
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MOUTH PARTS OF AN INSECT
MOUTH PARTS OF AN INSECT
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HOLOMETABOLUS LYFE CYCLE
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HEMIMETABOLUS LIFE CYCLE
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DICOPTIC & HOLOPTIC EYES
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HOLOPTIC & DICOPTIC OF EYES
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HOLOPTIC TYPE OF EYES
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DICOPTIC TYPE OF EYES
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CULICOIDES
Common name : Biting midge, No-see-ums ,
Moose flies.
Host : All domesticated animals and man also.
Species : Culicoides puncticolis .
Morphology :
•The flies are very minute.
•The thorax and abdominal segments are similar.
•The wings are oval and hairy.
•Proboscis is adopted for blood sucking .
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CULICOIDES FLYCULICOIDES FLY
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CULICOIDES FLY
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LIFE CYCLE OF CULICOIDES FLY
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LIFE CYCLE The female flies laid eggs in mass damp marshy
ground near water sources.
Development proceeds the larva emerges out from
the eggs .
Four moulting occurs in larval stage ,which give
rise to pupa
After final moulting the pupa become adult .
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HABITAT AND HABITAT
Both animals and man are affected by these flies
The flies are main habitat of decaying vegetation
The flies are more active during sunset and
sunrise .
These flies fly short distance or near to their
breeding places.
The larva feeds on decaying aquatic vegetation
the adults are predacious and feeds on protozoa,
nematode and other predator.
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PATHOGENESIS Many viral disease such as Blue tongue and African
horse sickness are transmitted by these flies.
They are also responsible for causation of kind of
allergic dermatitis or seasonally occurring intense
pruritus in skin caused by Culicoides robertsi in
horse , called ‘Sweet itch’ Sweat itch’ or ‘ Queensland
itch in Australia.
There is loss of hairs on the dorsal part of body.
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BLUE TONGUE IN DOG
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BLUE TONGUE IN REPTILES
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SUMMER DEMATITIS OR QUEENSLAND ITCH
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AFRICAN HORSE SICKNESS
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SIMULIUM Common name : Black flies ,Turkey gnats , Buffalo
gnats.
Species : Simulium indicum , Simulium ornatum .
Morphology :
•They are stout bodied black coloured small sized flies .
•The piercing proboscis is short thorax is humped over the
head
•The male and female are morphologically .
•The pupa is boot shaped or slipper shaped .
•The antennae is 11 segmented.
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SIMULIUM FLY
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SIMULIUM FLY
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LIFE CYCLE The female fly laid their eggs just below the
surface of water on partially submurged stones
or vegetation in flowing water.
Hatching occurs, larva comes out
A mature larva formed after six moulting..
The mature larva pupate in brownish silken
cocoon like structure fixed to submerged stone .
In presence of favorable tempt. and light the
adult flies are emerges out .
.
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LIFE CYCLE OF SIMULIUM
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SILICON COCOON LIKE PUPA OF SIMULIUM
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PATHOGENESIS The adult females are blood sucker . Reponsible
for causation of haemorrhage and oedema.
There is restlessness and stampede caused by
painful bite of flies.
Interference with grazing resulting into heavy
production loss.
Intense bite cause vesicle and wart formation .
The pathogens of Leucocytozoonosis
transmitted by these flies.
.
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VESICULAR STOMATITIS
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ESTERN EQUINE ENCEPHALITIS
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PHLEBOTOMUSCommon name : Sand flies, Owl midge
Host : All domesticated animals,reptiles ,birds and man .
Species : Phlebotomus argentepes , phlebotomus papatasi .
Morphology :
•These are brownish moth like small sized flies .
•The piercing proboscis is short thorax is humped over the
head
•The whole body and wings are hairy .
•The mouth parts contains several knife like stylets .
•The antennae is 16 segmented.
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PHLEBOTOMINE OR SAND FLY
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PHLEBOTOMINE OR SAND FLY
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LIFE CYCLE The mature female laid their eggs in dark and
moist places e.g rock crevices .
The eggs are white in colour then turn dark.
Hatching occurs then grayish white small
caterpillar like larvae come out
These larva is transformed to pupa after three
moulting.
The whole life cycle can be completed in about
4-6 weeks.
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LIFE CYCLE OF PHLEBOTOMINE FLY
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PATHOGENESIS They are responsible for transmission of
protozoa .
Phlebotomus argentipes transmits Leishmania
donowani , the causative agent of Visceral
leishmaniasis or Dumdum fever or Kalazar.
P. papatasii transmits Leishmania tropica
causative agent of Oriental sore or Delhi boil or
Jerico boil.
They also transmits the viruses of Sand fly fever
and Yellow fever.
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KALAZAR OR VISCERAL LEISHMANIASIS
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JERICO BOIL /KALAZAR OR BLACK FEVER
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CUTANEOUS LEISHMANIASIS
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SAND FLY FEVER/CARRION’S DISEASE
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CULICIDAE Common name : Mosquitoes .
Host : Man ,all domesticated animals,reptiles , and. birds
Species : Phlebotomus argentepes , phlebotomus
papatasi .
Morphology :
•These are slender bodied flies .
•The legs are long and eyes are prominent
•The thorax is wedge shaped .
•The mouth parts is adopted for blood sucking .
•The antennae is 15 segmented.
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ANOPHELINE FLY
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ANOPHELIES / CULEX
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CULICINE FLY
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LIFE CYCLE Female anopheles prefer to laid their eggs
during night hour.
The eggs are always in batches having air filled
floats on either.
Hatching occur larva come out with in two
days.
After further development larva transform to pupa
with in two days
The adult mosquitoes emerges out after splitting on the
dorsal aspect of the pupal covering.
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LIFE CYCLE OF CULEX
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COMPRATIVE STUDY OF ANOPHELINE / CULICINE
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PATHOGENESIS Anopheles responsible for transmission of
various protozoan and nematodal disease like
Plasmodium vivex the causative agent of
human malaria .
The are also transmits Dirofilaria immitis, the
‘Dogs heart worm’ and Wuchereria bancroffti.
Culex transmits Plasmodium gallinaceium , the
causative agent of avian malaria and Dirofilaria
immitis.
Aedes involve in transmission of viruses of
Dengue fever and yellow fever in man.
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DOG AFFECTED WITH ‘HEART WORM’
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Aedes causing ‘DENGU FEVER’