Cestodes, Trematodes, Acanthocephalans Flashcards
phylum platyhelminthes includes 2 classes
trematodes and cestodes
what are trematodes and cestodes
flatworms that lack body cavity
cestodes have 2 subclasses
eucestoda (true tapeworms) and cotyloda (pseudotapeworms)
life cycle of platyhelminthes
always indirect and need 1 or 2 intermediate hosts (arthropods, fish, mammals)
larval stages of some tapeworms are found in domestic animals and look like fluid filled sacs with one or more scoleces
bladder worms
what are scoleces
heads
eucestodes are…
multicellular but lack body cavity
where are eucestodes organs
embedded in parenchyma
body parts of eucestodes
scolex (head) with 2-4 suckers and may have snout with hooks, neck, stroblia (body) immature, mature, and gravid proglottids
process of gravid proglottids
break off stroblia and pass through host feces and new proglottids are formed from the neck
most common tapeworm found in sm. intestines of dogs and cats
Dipylidium caninum
prepatent period for D. caninum
14-21 days
what are found in the feces, fur, and bedding of dogs with D. caninum
gravid proglottids
what is required for an animal to get tapeworms?
fleas
dogs become infested with this sp. of tapeworms from ingesting rabbits or hares
Taenia pisiformis
dogs become infested with with this sp. of tapeworms from ingesting ruminants
Taenia hydatigena and T. ovis
feline tapeworms
T. taeniaeformis and Hydatigera taeniaeformis
tapeworms associated with unilocular and multilocular hydatid disease
Echinococcus granulosus and E. multilocularis
parts of tiny tapeworms
3 proglottids: one immature, one mature, one gravid
human bladder worm that is associated with “beef measles”
Taenia saginata
human bladder worm associated with “pork measles”
Taenia solium
parasites of sm intestines of rodents but occasionally dogs and humans
Vampirolepis nana and Hymenolepis diminuta
Spirometra sp. peudotapeworms common name
zipperworms
where are zipperworms found
jejunum of dogs and cats in florida and along gulf
referred to as “broad fish” tapeworms
Diphyllobothrium sp.
how does Diphyllobothrium sp. reproduce
continually releases eggs until they shed entire uterine content
what does Diphyllobothrium sp. ovum look like
egg shaped with blobs inside
another name for flukes
trematodes
what do trematodes look like
unsegmented and leaf like
where are the organs in trematodes
embedded in loose tissue (parenchyma)
lizard poisoning fluke of cats
Platynosomum fastosum
P. fastosum ovum appearance
very oval, defined membrane, lots of “bubbly” looking material inside
salmon poisoning fluke of dogs
Nanophyetus salmincola
intestinal fluke of dogs and cats
Alaria sp.
blood fluke that parasitizes the mesenteric veins of of the int. of dogs
Heterobilharzia americanum
H. americanum ovum appearance
very round, nothing very defined inside
lung fluke of dogs and cats
Paragonimus kellicotti
where do lung flukes live
cystic spaces within lung parenchyma
prepatent period of lung fluke
20-26 days
liver fluke of ruminants
Fasciola hepatica
where are liver flukes found
bile ducts of liver
prepatent period of liver flukes
56 days
lancet flukes of sheep, goats, and oxen
Dicrocoelium dendriticum
rumen flukes
Paramphistomum and Cotylophoron
blood flukes of humans
Schistosoma sp.
thorny-headed worms
Acanthocephalans
Acanthocephalans found in small intestines of dogs
Oncicola canis
