Lab 1-Schistosoma Flashcards
Kingdom of Schistosoma?
Protozoa
Subkingdom of Schistosoma?
Eumatozoa
Phylum of Schistosoma?
Platyhelminthes
Dioecious
Contains different sexes
Why is Schistosoma an unusual fluke?
It is dioecious
Where do they live in mammals?
copula (narrow part) of vasculatures
What is its intermediate host?
Snail
What form of the Schistosoma (or life stage) does it exit the direct host?
As eggs laid by females
How are the eggs released into the water from human body?
Eggs are released into tissues and are sent to bladder or intestine to be voided out through urine or feces
How do the eggs hatch
By contacting water
Miracidium
ciliated larvae of Schistosoma that hatches from the egg
How long does a miracidium have to find a snail host before it dies?
A few hours
How does miracidium locate snails?
Chemotaxis
Cercariae
- free-living larval stage of Schistosoma, usu. possessing a tail
- developed from germ balls in daughter sporocyst
Class of Schistosoma?
Digenea
Where does the mother sporocyst develop in the snail?
Near the site of infection
Where do daughter sporocysts go to develop cercariae?
to the gonads
Where do daughter sporocysts go to develop cercariae?
to the gonads of snail
Where do cercariae migrate after leaving daughter sporocyst?
to the snail mantle cavity
How does cercariae know when to leave snail?
it leaves at certain times of day that people/other hosts are out
Schistosomulae
Migratory stage between cercariae and adult schistosomes
Where do schistosomula grow and mature?
liver
Do schistosomes have 2 separate sexes?
yes
Where is the reproductive system restricted to in the body of adult male schistosoma?
anterior portion
