Entomology Flashcards
Metamorphosis
Series of changes which an insect passes in its growth from egg to adult
Insect head
Antennae and eyes, ocelli and three pairs of jaws (mandible, maxillae, labium)
Insect thorax
3 segments each bearing a pair of legs, the second and third may also bear a pair of wings
Insect abdomen
Usually has 11 segments
Arachnid cephalothorax
No antennae, chelicerae and mouth parts do not have jaw, four pairs of legs
Vector borne protozoa
Malaria, leishmania, trypanosomiasis
Vector borne viruses
YF, Dengue
Vevtor borne bacteria
Plague, typhus, relapsing fever
Mechanical transmission
Trachoma on Musca sorbens, Shigella
Malaria
Bite of Anopheles
Lymphatic filariasis
Bite of Culex, Anopheles, Aedes and Mansonia
Diarrhoea disease
Faeces of houseflies’
Trachoma
Musca sorbens - contact with eye secretions
Dengue
Bite of Aedes
Leishmania
Bite of Phlebotamine sandfly
Onchocerciasis
Bite of Simulium black fly
T brucei
Bite of Glossina tsetse fly
T cruzi
Bite of Triatoma, Rhodnius, triatomine bug
Rickettsia prowazeki
Bite of Pediculus humanus
Plague
Bite of Xenopsylla rat flea
Japanese encephalitis virus
Bite of Culex, Anopheles, Aedes and Mansonia
Yellow fever
Bite of Aedes and Haemagogus
Relapsing fever (Borrelia duttoni & recurrentis
Transovarial or bite of Ornthodoros and P humanus
Loa loa
Bite Chrysops deer fly
Scrub typhus O tsutsugamushi
Transovarial or bite of Leptotrombidium chigger mite
Lyme Borrelia burgdorferi
Bite of Ixodes
Tick borne encephalitis
Bite of Ixodes
West Nile virus
Bite of Culex
Zika virus
Bite of Aedes
Anopheles Time of biting
Night, inside houses
Aedes Time of biting
Day
Tsetse and flies Control
Traps
Mosquito larvae Control
Larval source management (LSM) - intermittent irrigation/flushing, chemical larvicides (Abate), treat with predatory copepods, reduce water (ie tyres and garbage, bacterial toxins (Bacillus), fish to eat larvae
Culex larvae Control
Moving water, floating polystyrene beads in latrines
Aedes Control
Wolbachia
Anopheles Control
IRS indoor residual spray, LLIN long-lasting insecticidal nets
Simulium Control
Aerial spraying of fast flowing water
Mosquito Subfamily: Anophelinae
Anopheles
Mosquito Subfamily: Culicinae
Aedes, Culex, Mansonia, Haemagoggus (+Toxorhynchites)
Anopheles Eggs
Cigar shaped, air-filled lateral floats
Anopheles Larva
Lays parallel to water, no siphon creates feeding current with mouthbrushes
Mosquito Life cycle
Egg -> larva -> purpae -> adult
Culicine Eggs
Lack float
Aedes Eggs
Black, laid singly on moist surface, can withstand dessication for months
Culex Eggs
Brown, thin rafts
Mansonia Eggs
Stick to underside of aquatic vegetation
Culicine Larvae
Siphon, hang at angle to surface
Mosquito Blood meal
Only the female takes a blood meal - protein for egg development
Mosquito Pupae
Comma shaped, active, non-feeding - cannot distinguish anopheline from culicinae
Mosquito Proboscis
Sheath that surroundes mouthpart stylets - pair of maxillae, mandibles, one hypopharyx and the labrum (food canal)
Anopheles Travel distance
2-4km
Anopheles Monitoring population
Ladle for larvae/pupae, human landing catches (unethical), light traps then blood meal identification with anti-human Ab, dissection and age-grading by ovaries