Platyhelminthes

Question 1

What is “Larva Migrans”

Answer 1

The migrations of the larval stage of some helminths in the tissues of an abnormal host without development - cutaneous of visceral

Question 2

In the phylum Platehelminthes
There are two main classes,
The common names are Flat worms and Tapeworms what are the scientific names for these two classes?

Answer 2

Flatworms - Trematodes

Tapeworms - Cestodes

Question 3

What colour are the eggs of Paramphistomes?

What Class are they?

Answer 3

Eggs are Pale grey in colour.

Trematodes

Question 4

Oriental Lung Fluke how do you identify this Trematode?

How can humans prevent getting this?

Answer 4

Eggs of about 100micrometers are found in sputum or faeces, they have a distinct operculum and are unembryonated when passed.
Most human infections result from eating raw or pickled freshwater crabs or crayfish.

Question 5

Chinese Liver Fluke are found in humans as a definitive host what is the second intermediate host and how can we control being infected by it?

Answer 5

Freshwater Fish

And make sure all freshwater fish is fully cooked!

Question 6

What is a scolex and what class/subclass of Platyhelminthes have these?

Answer 6

A Scolex is a specialised attachment organ at the anterior end.
They are found on Cestodes in the subclass Eucestoda.

Question 7

In the Tarniids (Family Tarniidae) there are 2 main parasites we are concerned with, Echinococcus and Taenia. What’s the main distinguishing features?

Answer 7

Echinococcus is much shorter being only a few millimetres with 3-4 proglottids where Taenia can be several meters with thousands of proglottids.