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Answer
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Article
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| Fill in the missing words about cestodes
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A cestode (tapeworm) is a chain (strobila) of progressively maturing reproductive units called proglottids anchored at one end to the intestinal wall by a hold-fast organ called the scolex.
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| What species of Taenia occur in dogs?
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- Taenia ovis
- Taenia hydatigena
- Taenia pisiformis
- Taenia multiceps
- Taenia serialis
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| What are the more obvious morphological features of the scolex of a cyclophyllidean tapeworm?
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- Four suckers
- Rostellum with rows of large hooks
- Unsegmented neck (behind the scolex) which gives rise to new segments
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| Describe the features of a cysticercus
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- Fluid filled bladder, containing a single invaginated head (protoscolex) - seen as a white blob on the wall of the cyst
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| In which host(s) would you expect to find the cysticercus of T. hydatigena and where in the host might it be found?
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- Sheep (mostly)'
- Cattle
- Pigs
- Found in the peritoneal cavity
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| What is the difference between a coenurus and a cysticercus?
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- A coenurus is a fluid filled bladder with multiples (dozens) of inverted head attached to the wall
- Whereas the cysticercus has only a single inverted scolex.
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| How does the distribution of hydatid cysts differ in sheep, horses and humans?
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- Sheep = most are in the lungs with smaller numbers in the liver
- Horses = nearly all are in the liver
- Hymans = most are in the liver, with some in the lungs and a few elsewhere
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| Summarise complex metamorphosis and give an example of a species of insect which uses it
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- Larva emerges from egg
- Larva grows and moults
- Larva pupates
- Adult emerges from pupa
- Flies
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