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| + | #REDIRECT[[:Category:Insecta]] |
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| − | {{toplink
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| − | |backcolour =
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| − | |linkpage =Parasites
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| − | |linktext =PARASITES
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| − | |pagetype=Bugs
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| − | |sublink1=Arthropods
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| − | |subtext1=ARTHROPODS
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| − | }}
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| − | <br>
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| − | ==Classification==
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| − | [[Image:Arthropod classifiation.jpg|thumb|right|150px|Arthropod Classification - copyright nabrown RVC]] | |
| − | The phylum arthropoda is divided into several subphylums including Chelicerata (which includes the arachnids), Myriapoda, Hexapoda (which includes the insecta), Crustacea and Trilobitomorpha. These are then divided into many classes. The two of major veterinary importance are the '''insecta''' and '''arachnida''' classes.
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| − | ==Structure and Function==
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| − | ===Insect Body===
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| − | *Covered by an exoskeleton secreted by underlying epidermis
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| − | *Divided into head, body and abdomen
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| − | ===Insect Head===
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| − | *Capsule of fused plates at the anterior end of the body
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| − | *One large pair of compound eyes
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| − | **Honeycomb like corneal facets
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| − | *Three simple ocelli
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| − | **Dorsal to compound eyes
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| − | *One pair of antennae
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| − | ====Antennae====
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| − | *Form varies amongst insecta
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| − | **E.g. long and segmented, short and squat etc.
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| − | *Hairs sometimes present
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| − | *Aristae (bristles) sometimes present
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| − | ====Mouthparts====
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| − | *Modification depending on feeding method
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| − | *Insects which suck up liquified food have an expanded sponge like labellae
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| − | **Cannot penetrate skin
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| − | **Palps
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| − | *Insects which suck blood have long slender mouthparts for piercing skin
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| − | **Hypopharynx
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| − | **Mandibles
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| − | **Labrum
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| − | **Maxillae
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| − | *Larval mouthparts are prominent
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| − | **One pair of hooks
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| − | **Cephalo-pharyngeal skeleton
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| − | **Mouthparts help identify larvae
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| − | ===Insect Thorax===
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| − | | |
| − | *Divided into three segments
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| − | **Prothorax, mesothorax and metathorax
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| − | *Each segment has one pair of legs attached
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| − | *One or two pairs of wings may be present on the mesothorax and metathorax
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| − | | |
| − | ====Leg====
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| − | | |
| − | *Leg is attached to the body by '''coxa'''
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| − | | |
| − | *Trochanter
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| − | *Femur
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| − | *Tibia
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| − | *Tarsus, which is composed of several segments
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| − | *Claw
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| − | ====Wing====
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| − | *Insects usually posess two pairs of wings
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| − | | |
| − | *Diptera have a reduced second pair of wings called halteres for balance
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| − | | |
| − | *Membranous outgrowth of the integument
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| − | *Strengthened by a network of veins comprising breathing tubes (trachea) and blood vessels
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| − | *The wing venation can be used in identification
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| − | ===Insect Abdomen===
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| − | ====Respiratory System====
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| − | ====Spiracles====
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| − | ====Alimentary and Excretary System====
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| − | ====Nervous System====
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| − | | |
| − | ====Fat Body====
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| − | ====Reproductive System====
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| − | ==Life cycles==
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| − | Fleas
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| − | Lice
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| − | Nuisance flies
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| − | Biting Flies
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| − | Myiasis Flies
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| − | *''Oestrus ovis'' causes infection in [[Respiratory Parasitic Infections - Pathology#Oestrus ovis|nasal cavity]]
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| − | *''Hypoderma bovis'' in [[Muscles Inflammatory - Pathology#Arthropods|myositis]]
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| − | *Cause [[Parasitic skin infections - Pathology#Flies|skin infections]], Simuliidae and Ceratopogonidae transmit [[Parasitic skin infections - Pathology#Onchocerciasis|onchocerciasis]], flies involved in [[Parasitic skin infections - Pathology#Cutaneous habronemiasis|cutaneous habronemiasis]] and [[Parasitic skin infections - Pathology#Stephanofilariasis|stephanofilariasis]], [[Parasitic skin infections - Pathology#Protozoa|protozoal skin infections]]
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| − | *[[Skin Immunologic - Pathology#Flea bite hypersensitivity|Flea bite hypersensitivity]]
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| − | *[[Skin Immunologic - Pathology#Culicoides hypersensitivity|Culicoides hypersensitivity]]
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