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8 Cards in this Set
- Front
- Back
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Adaptations for endoparasitism |
attachment structures (hooks)
modified body wall --no cilia, little musculature; enviornment provides everything, no hunting needed --reduced sensory structures --absorb nutrients --resist host defenses
strategies --complex life cycles
high reproductive potential + polyembryony (asexual duplication) |
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definitive host |
parasite reaches sexual maturity + reproduces |
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intermediate host |
young parasites; usually eaten by definitive host
can have multiple |
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Trematoda characteristics |
"flukes" unsegmented body diocecious
Body: mouth with oral sucker pharynx (suction) ventral sucker intestinal ceca that branches to either side nephridiopore
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Trematoda lifecycle |
adult (DH) miracidium (IH)
sporocyst (IH)- polyembryony, asexual generatn
redia (IH) - germinal balls, polyembryony, soldiers (attach other redia and sporocysts) and reproductive (polymorphic)
cercaria-freeliving, musuclar tail, burrow in skin
metacercaria (IH2) in flesh; ingested by DH
adult (DH) |
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Schistosoma |
Trematodes eggs have spines infect brain = confusion, double vision, etc
schisotosomaiasis (bilharzia) --mesentary veins --thru blood vessel wall to gut (damage)
Swimmer's itch --birds, etc w/ thin skin as DH --attempt to infect humans, skin too thick = dies within skin |
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Cestoda |
Tapeworms
no mouth, GVC sucker = prevents parastalsis (digestion) from moving it thru digestive tract
Scolex (head w/ sucker, neck--"proliferative zone") Strobila (many proglottids, w/ M+F reprdctv systm) |
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Platyhelminthes |
Cestoda Trematoda Turbellaria (cuties) |
