Chapter 11 Flashcards
(41 cards)
What kind of reproductive organs do tapeworms have
hermaphroditic, except for nematoparataeniidae
What reproductive organs mature first on tapeworms
male then female
new proglottids bud off from neck region
mature proglottids move along strobila
Where do the proglottids come from, what is this area called
they are budded off from the germinative region
What affects the rate of maturation of proglottids
temperature
available carbs
reduced in high density infections
maximum length of the tapeworm
Which tapeworm would Dr Stewart use to lose wieght
diphylabothrium
How do tapeworm eggs leave the adults
proglottids have an opening from the uterus to the outside and eggs are produced continously
or
eggs are retained in the uterus which expands until it eventually reaches explosive pressure
Ture or false proglottids are always shedding
false
What occurs after gravid proglottids mature
the shed in segments either single or in short chains,
In the case of hymenolepis moniezia, where in the host are eggs found
the proglottid segments rupture the intestine, and the eggs are in the feces
What tapeworm has proglottids that can crawl
Taenia pisiformis of cats
Why might a gravid proglottid develop a secondary opening to the uterus
to shed eggs as the proglottids crawl
Taenia pisiformis
What solution does active proglottids provide?
It makes it so that the parasite doesn’t need a vector to spread, they have a better chance of infecting something because it can crawl around
What is one of the problems with transmission through proglottids
animals don’t tend to graze near their feces, some use insects as intermediate hosts to solve this
What tapeworm is also called the cucumber tapeworm, who are its main hosts? why does it have that name?
dipylidium caninum, cats and dogs, becuase the egg packets look like cucumbers
What is the secondary host of dipylidium caninum
fleas or louse
How are the definitive hosts of dipylidium caninum usually infected?
dogs and cats eat something (could be an intermediate host) with cysticercoids, develops into adults in dog/cat, eggs are passed in feces and eaten by fleas or louse, eggs hatch and become cysticercoids in flea/louse, flea/louse infects intermediate host or the same dog/cat
What are the definitive and intermediate hosts of hymenolepis diminuta
definitive: rodents
intermediate: flour or grain beetle
What stage is hymenolepis diminuta at in each host
eggs and cysticercoids (hemocoel) in flour/grain beetle,
cysticercoid and adult tapeworm in rodents,
eggs in rodent feces
What kind of tapeworms have proglottids that crawl out of the anus instead of waiting for its host to defecate
some taeniid proglottids
How do hermaphrodite tapeworms self fertilize? what is their preference?
by folding back in itself, the older mature female organs and the younger mature male organs can fertilize, they would rather cross fertilize to increase diversity
What is premunition?
When you have only one tapeworm at a time in a host, occurs with longer tapeworms that don’t want competition, they might secrete products that prevent others from developing
Explain the pseudophyllidean life cycle
primitive, have free swimming larvae calle coracidium
What do pseudophyllidean cestodes hatch as and what do flukes hatch as
pseudophyllidean: coracidium
flukes: miracidium
What is the broad 10ft tapeworm that infects humans, where is it found
diphyllobothrium latum, great lakes of North America
