Zoology - Parasitic Flatworms

Schistosome - intermediate host and definitive host

1. snail

2. mammal

Life cycle of typical trematode

1. egg → maracidium → sporocyst → (snail) → redia → cercaria → metacercária → adult flute (vertebrate)

Fasciolidae - intermediate host and definitive host

1. no IH

2. mammals; herbivores

Fascioloides magna - intermediate host and definitive host

1. n/a

2. deer, elk, bison, other ruminants

ribeiroia ondatrae - intermediate host and definitive host

1. snail and tadpole

2. birds

Dicrocoelium dendriticum - intermediate host and definitive host

1. snail and ants

2. bile ducts of sheep, cattle, goats, pigs, and deer

chlonorchis sinensis - intermediate host and definitive host

1. snail and fish muscle

2. humans

cestoidea: tapeworms -three parts

1. scolex

2. neck

3. strobila

scolex of tapworms

head site of attachment to host

neck in tapeworms

stem cells for production of proglottids (reproductive segment)

strobila of tapeworms

linear series of maturing proglottids (reproductive segments)

proglottids in tapeworms

reproductive segments

diphyllobothrium - intermediate host and definitive host

1. copepod and fish

2. canines felines mustelids bears and humans

taenia saginata - intermediate host and definitive host

1. cows

2. humans

taenia solium - intermediate host and definitive host

1. humans and pigs

2. humans can be final host

why is the pork tape worm the most dangerous tapeworm of humans?

we can be final hosts in various tissues

what is tape worm known as ?

taenia solium

dipylidium caninum -- intermediate host and definitive host

1. flea

2. cats and dogs

moniezia - intermediate host and definitive host

1. grain mites

2. sheets and goats