Playhelminthes Flashcards
Which of the following statement is correct regarding about the class of turbellaria? A) Being infected with one is extremely severe and the prognosis will be a week at best B.) Free living organism C.) Only will ever find in a host, very host dependant D.) An extinct species
B
Is class monogenea, an endo or ecto-parasite? What species does it typically occupy?
Ectoparasite of fish
How do monogenea parasites normally reproduce?
They are haemophrodites. They produce sperm and eggs and fertilise themselves
What features are located on the posterior and the inferior end of the mongenea parasite?
Anterior end- prohaptor Posterior end- haptor (or opistohaptor)
Are trematodes internal or external parasites?
Internal parasites
Describe the shape of a trematode:
Leaf shaped
Where is the sucker located on a trematode
Located on the ventral surface
Do dignea replicate sexually or asexually?
Alternate between sexual and asexual reproduction phases
True/False Statement:
Dignea are very reliant on water for reproduction.
True
What is the first intermediate host of Dignea always going to be?
First intermediate host of Dignea will always be a mollusc
Describe the general lifecycle of Dignea:
General life cycle:
- Eggs go from definitive host to the water
- Hatches free swimming larvae miracidium
- Transforms into a sporocyst
- Sporocyst undergoes asexual reproduction to become a Rediae
- Rediae undergoes asexual reproduction to forma cercaria
- Cercariae emerges from the snail
- Develop in metacercariae
Metacercariae develop into adults when eaten by the definitive host
Below is the egg from a parasite:
A) Name the parasite that this came from
B) Name a feature that allowed for this diagnosis
Fasciola Hepatica
Presence of a terminal operculum ( lower right hand corner)
What is the host site of Fasciola Hepatica? (specific place of specific organ)
Liver (specifically within the bile ducts of the mammals)
What is the prepatent period of Fasciolidae heptatica?
6-12 weeks
What site do the paramphistomones usually occupy?
Usually occupy the rumen
Describe the appearance of the Dicrocoelium Dendriticum fluke:
Thin translucent fluke
What feature of Dicrocoelium Dendriticum is unique to that specific parasite?
Cercaria is ingested by the ant where it then becomes metacercaria, changing behaviour of the ant so it becomes ingested by the definitive host