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Cestodes
tapeworms for my parasitology final
12
Biology
Undergraduate 4
04/29/2009

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Term

scolex with grooved bothria

human infection results from eating 2nd int host or paratenic host infected with plerocercoids

2% of infected have megaloblastic anemia from B12 deficiency

Definition
Diphyllobothrium latum
Term
eggs resemble trematode eggs (genera)
Definition
Diphyllobothrium spp
Term

dog tapeworm

armed rostellum

Taeniid type eggs

Definition
Taenia pisiformis
Term
eggs resemble a trematode egg where the oncosphere is encased by a two-layered enbryophore with radial striations
Definition
Taeniid egg
Term

beef tapeworm

ingestion of cysticercus in the measly beef

Definition
Taenia saginata
Term
Differences between Taenia saginata and Taenia solium
Definition

Taenia saginata has an unarmed rostellum and uterine branches >14

Taenia solium has armed rostellum and uterine branches of <14

Term

cysticercosis from ingestion of eggs that can occur in pigs and humans

neurocysticercosis

inflammatory resp from dead cysticerci

Autoinfection

Definition
Taenia solium
Term

Taeniid type eggs

humans are intermediate hosts

dogs are definitive hosts

ingestion of egg in humans leads to development of hydatid cyst in organs that contain protoscolices

Definition
Echinococcus granulosus
Term

multilocular cysts that develop in internal organs

ingestion of eggs from canid feces

humans are unsuitable hosts and protoscolices die but are filled with eosinophilic necrotic material

Definition
Echinococcus multilocularis
Term

does not require an intermediate host

ingestion of eggs that form cysticercoid in tissue from rodent feces

Autoinfection possible

Definition
Hymenolepis nana
Term

requires insect intermediate host (grain beetle)

cysticercoid develops and is infective 

humans not likely unless beetle ingestion

Definition
Hymenolepis diminuta
Term

cosmopolitan tapeworm of dogs

resembles Hymenolepis eggs

ingestion of flea intermediate with cysticercoid

Definition
Dipylidium caninum
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