CESTODES Flashcards
Gen. Characteristics of Cestodes
General Characteristics:
- Does not have a digestive tract
- Hermaphroditic
- Bilateral symmetry
- Segmented
coracidium
aquatic development of embryo
Cyclophyllidean species
Taenia spp. Dipylidium,
Hymenolepis, Raillietina,
Echinococcus
Pseudophyllidean
Diphyllobothrium,
Spirometra
T. solium adult specie can be distinguished. TRUE or FALSE?
false
Proglottids/Strobila of T. solium
7-15 lateral branches (dendritic
or fingerlike)
smallest tapeworm
Hymenolepis nana / dwarf tapeworm
Y shaped hooklets
Hymenolepis nana / dwarf tapeworm
IS of T. saginata
cysticercus bovis
dichotomous/ tree-like
T. saginata
has direct and indirect infective stages
H. nana / dwarf tapeworm
direct IS of H nana
Eggs
Indirect IS of H nana
cercocystis.cysticercoid larva
rat tapeworm
Hymenolepis diminuta
fan like arrangement of hook
Hymenolepis diminuta/rat tapeworm
IS of H. diminuya
cercocystis.cysticercoid larva
other name/s of Dipylidium caninum
(dog tapeworm, cat
tapeworm, double-pored tapeworm)
rose
thorn shaped hooks
Dipylidium caninum (dog tapeworm, cat tapeworm, double-pored tapeworm)
strobila characteristics of Dipylidium caninum
pumpkin seed/melon seed/rice grain-shaped
Infective stage Dipylidium caninum
cercocystis/ cysticercoid larva
D. latum new name
Dibothriocephalus latus
D. latum other names
fish
tapeworm, broad fish tapeworm
strobila of D. latum
rosette like coiled uterus
1st intermediate host of D. latum
Copepods (cyclops/diaptomus) -procercoid larva
2nd intermediate host: of D. latum
freshwater fish- plerocercoid
larva
IS of D. latum
plerocercoid
resembles Taenia spp. egg
Echinococcus granulosus
IS stage of E. granulosus in intesine
embryonated egg ingested that becomes Hydatid cyst
diagnostic stage of E. granulosus
cyst
tests for E. granulosus
casoni intradermal test (>5cm for 30
mins) bentonite flocculation test
adult forms of this cestode are mistaken for adult Diphyllobothrium latum
Sparganosis
