Week Three: Phylum Platyhelminthes (Chapter Five) Flashcards
What class is eucestoda, in?
Cestoda
What class is the platyhelminthe, fluke, in?
Trematoda
What is cotyloda?
Pseudotapeworm
What is a eucestoda?
True tapeworm
What do flukes look like?
Flat, leaf shaped
What do tapeworms look like?
Long, ribbon like, segmented
What are proglottids?
Section of a tapeworm that contains eggs (end pieces of parasite)
What is the scolex?
Head of a cestode
What is a cestodes organ of attachment and how are nutrients absorbed?
Lining of small intestine; nutrients are absorbed through the tegument
What are the two types of attachment cestodes use to attach to the mucosa of the small intestine?
Acetabula (suckers, unarmed tapeworm)
Rostellum (backward facing hooks, armed tapeworms)
What does hermaphroditic mean?
Contains complete sets of both male and female reproductive organs
What does hexacanth mean?
Six hooks
What is the dipylidium egg?
Egg packet containing multiple hexacanths within one egg
What is a taenia?
Egg has one hexacanth within the egg
Explain the life cycle of a cestode
- Gravid proglottids pass to outside environment and rupture
- Egg must be ingested by intermediate host
- (Within host-egg develops into metacestode)
- Definitive host becomes infected by ingesting intermediate host
How does the definitive host become infected by a cestode? (Dipylidium)
By ingesting the intermediate host
ex. dog eating a flew
What is an example of an intermediate host of a cestode (taenia)?
Arthropods
- Fleas
- Mites
How does the definitive host become infected by a cestode? (taenia)
By ingesting the intermediate host
ex. dog eats a bird that in infected with parasite
What is the cysticercus stage?
Bladder worm stage
Explain the appearance of cotyloda
Long, segmented, flattened, almost ribbon like
Contains scolex and bothria
What are bothria?
Two slitlike, hold fast organelles on anterior end of pseudotapeworm
Where is the attachment site of cotyloda and how do they absorb nutrients?
Lining of small intestine; absorb nutrients through the body wall
Do cotyloda have one or two sexes?
Hermaphroditic- two (both male and female)
Dipylidium caninum:
Host, location of adult, intermediate host, transmission route, and common name
Host: Dogs and cats Location of adult: Small intestine Intermediate host: Adult fleas Transmission route: Ingestion of infective adult flea Common name: Tapeworm
