Lecture 23 Flashcards
What are resources for arthropods? (7)
o Hair o Skin o Secretions o Body fluids o Body tissues o Excrement o Domicile
what are the arthropod ectoparasites of humans? (6)
- Bed bugs
- Fleas
- Lice
- Dust mites
- Follicle mites
- Scabies mites
do bed bugs have wings?
no
what type of development do bed bugs have?
• Hemimetabolous
What do bed bugs feed on?
only blood
bed bugs reproduce through _______ ______
traumatic insemination
describe the reproductive process of bed bugs
Males have a long aedeagus to introduce sperm
Ectospermalege on females
aedeagus is inserted into the ectospermalege & through the female’s abdomen
Sperm accumulates in mesospermalege & is released into the hemolymph until it makes its way into the seminal conceptada (ovaries)
what are the components of the Paragenital sys of a female bed bug? (3)
♣ Ectospermalage
♣ Mesospermalege
♣ Seminal conceptacle
Harbourage/refugium
where bed bugs hide while digesting blood meal
The more _____ the female mates with males, her lifespan ______ b/c of the trauma experienced
frequently
decres
do bed bugs only feed on humans?
no
what type of development do fleas have?
• Holometabolous
what do fleas feed on?
blood - specialist feeder on blood
Describe the body shape of fleas
laterally flattened
what is the host for fleas?
Most infest mammals, but some infest birds
what is the most common pest flea in canada?
cat flea
describe the setae of fleas
backward directed
describe the larva of a flea
have a specialized knife like structure that cuts through the egg shell
no legs
lots of hair
Found in nest of host or envr
Feed on fecal pellets from the adults
what is the name of the mesoparasite flea?
chigoe flea
describe the growth of the chigoe flea
Go to host, penetrate skin & then they undergo neosomy development to incres in size
what type of development do lice have?
• Hemimetabolous
Do lice have wings?
no
what is the diet of lice?
blood
What is the host of lice?
humans
what are the 3 type of lice on humans?
head louse
body louse
pubic louse (crabs)
what specialization do head lice have?
claws on tarsus to live in hair
nits
eggs of head lice
where do head lice lay their eggs?
cement onto hair follicles
how do you determine if there is an infestation of head lice?
by the location of nits if it is near the scalp, no infestation
how are head lice transmitted?
by fomites
prevalence
prop of hosts infested (usually %)
mean intensity
mean # of parasites per infested host
where do body lice lay eggs?
on clothing
what is the only louse that doesn’t lay its eggs hair/feathers of its host? where does it lay its eggs instead?
body lice
on clothing
where do you commonly find body lice?
in areas of social strife (ex: war)
what type of louse is a vector of typhus?
body lice
how do you get rid of body lice?
wash clothes
where do you find crab louse?
Found on parts of body where hair is thicker (Ex: eyelashes)
are mites insects?
no, just arthropods
what are dust mites vulnerable to?
desiccation
what is a consequence of house dust mite infestation?
House-dust allergy: allergies in response to bodies of mites (molted exoskeletons) & mite feces
what mites are too small to see with the naked eye?
follicle mites
what mites have 4 pairs of legs?
follicle mites
describe the spp of follicle mites
2 species on humans – 1 on hair follicles & 1 on sebaceous glands
what do follicle mites feed on?
oily secretions
