Ch 46 Cestodes Flashcards
What phylum do cestodes, trematodes, and acanthocephalans belong to?
Phylum Platyhelminthes
What are true tapeworms classified as?
Eucestoda
What are pseudotapeworms classified as?
Cotyloda
What are acanthocephalans commonly known as?
Thorny-headed worms
What type of life cycle do tapeworms have?
Always indirect
What are the possible intermediate hosts for tapeworms?
- Arthropods
- Fish
- Mammals
What is the head of a true tapeworm called?
Scolex
What are the segments of the body in true tapeworms called?
Proglottids
What is the term for the body of a true tapeworm?
Strobila
What do gravid proglottids do?
Break off and pass out of the body
What does each egg of a true tapeworm contain?
A fully developed embryo
What structure do pseudotapeworms use for attachment?
Bothria
What is the prepatent period for Dipylidium caninum?
14 to 21 days
Which tapeworm is most common in the small intestine of dogs and cats?
Dipylidium caninum
How do dogs become infected with Taenia pisiformis?
By ingesting rabbits and hares
What is the zoonotic potential of Echinococcus spp.?
Associated with unilocular and multilocular hydatid disease
What are the two types of tapeworms found in humans?
- T. saginata (beef tapeworm)
- T. solium (pork tapeworm)
What type of trematodes are only parasitic in domestic animals?
Digenetic trematodes
What is the liver fluke of cattle, sheep, and other ruminants?
Fasciola hepatica
What are the two muscular attachment organs in trematodes?
- Anterior sucker
- Ventral sucker
What do acanthocephalans lack?
A true gut
Fill in the blank: Tapeworms have an _______ life cycle.
indirect
True or False: Eucestodes and Cotyloda are both types of tapeworms.
True
What is the function of the scolex in tapeworms?
Attachment organ
Where are mature proglottids found in a true tapeworm?
Close to the body
What is the name of the lung fluke of dogs?
Paragonimus kellicotti
What is the blood fluke associated with dogs?
Heterobilharzia americanum
What is the basic structure of trematodes?
Unsegmented and leaflike
What type of fluke is Platynosomum fastosum?
Lizard poisoning fluke of cats
What unique characteristic do mature proglottids of pseudotapeworms have?
Separate along the long axis for a short distance
