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VET 278- Parasites > Playhelminthes > Flashcards

Playhelminthes Flashcards

1
Q

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

A

B

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2
Q

Is class monogenea, an endo or ecto-parasite? What species does it typically occupy?

A

Ectoparasite of fish

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3
Q

How do monogenea parasites normally reproduce?

A

They are haemophrodites. They produce sperm and eggs and fertilise themselves

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4
Q

What features are located on the posterior and the inferior end of the mongenea parasite?

A

Anterior end- prohaptor Posterior end- haptor (or opistohaptor)

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5
Q

Are trematodes internal or external parasites?

A

Internal parasites

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6
Q

Describe the shape of a trematode:

A

Leaf shaped

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7
Q

Where is the sucker located on a trematode

A

Located on the ventral surface

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8
Q

Do dignea replicate sexually or asexually?

A

Alternate between sexual and asexual reproduction phases

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9
Q

True/False Statement:

Dignea are very reliant on water for reproduction.

A

True

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10
Q

What is the first intermediate host of Dignea always going to be?

A

First intermediate host of Dignea will always be a mollusc

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11
Q

Describe the general lifecycle of Dignea:

A

General life cycle:

  1. Eggs go from definitive host to the water
  2. Hatches free swimming larvae miracidium
  3. Transforms into a sporocyst
  4. Sporocyst undergoes asexual reproduction to become a Rediae
  5. Rediae undergoes asexual reproduction to forma cercaria
  6. Cercariae emerges from the snail
  7. Develop in metacercariae

Metacercariae develop into adults when eaten by the definitive host

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12
Q

Below is the egg from a parasite:

A) Name the parasite that this came from

B) Name a feature that allowed for this diagnosis

A

Fasciola Hepatica

Presence of a terminal operculum ( lower right hand corner)

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13
Q

What is the host site of Fasciola Hepatica? (specific place of specific organ)

A

Liver (specifically within the bile ducts of the mammals)

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14
Q

What is the prepatent period of Fasciolidae heptatica?

A

6-12 weeks

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15
Q

What site do the paramphistomones usually occupy?

A

Usually occupy the rumen

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16
Q

Describe the appearance of the Dicrocoelium Dendriticum fluke:

A

Thin translucent fluke

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17
Q

What feature of Dicrocoelium Dendriticum is unique to that specific parasite?

A

Cercaria is ingested by the ant where it then becomes metacercaria, changing behaviour of the ant so it becomes ingested by the definitive host

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18
Q

Describe the appearance of the Paragonimus Westermani parasite:

A

Medium sized with a thick body covering of spins

19
Q

Below is an image of an egg from the Paragonimus Westermani parasite:

A.) State the species

B) Name a feature that allowed for this diagnoses

A

A.) Paragonimus Westermani

B.) Distinct operculum

20
Q

Describe the variations involved in the paragonias Westermini life cycle from the classcial digneian lifecycle:

A

Ingested by a mollusc first where it goes from sporocyst to redidae to cercariae. It is then ingested by a crustacean where it will go from cercariae to metacercariae.

21
Q

What site does paragonius Westermani normally occupy? and what is its appearance (in the definitive host)

A

Pairs of adults often will form cysts within the lungs

22
Q

Describe the appearance of the Clonorchis Sinensis fluke:

A

Slender, flat, translucent flukes

23
Q

Below is an image of an egg:

A.) Name the species

B.) Name the characteristic that allowed you to determine this

A

A) Clonorchis Sinensis

B) The distinctive presence of shoulders

24
Q

Name the difference in the life cycle of Clonorchis Sinensis when compared to the classic lifecycle of classic dignea:

A

Miracidea enters the snail. It then becomes a cercariae. Cercaria ingested by fish which then becomes metacercariae which is finally ingested by the human host.

25
Q

Name the final host of Clonorchis Sinensis in the host:

A

Bile ducts or the pancreatic ducts

26
Q

Name the parasites that are shown in the pictue below:

A

Schistosoma

27
Q

What is a difference in the lifecycle of schistosoma when compared with other dignea?

A

Main difference is that the cercaria enter through the skin and travel through the blood to reach the lungs and then travels onto the liver.

28
Q

What is a characteristic feature of the eggs of the family taeniidae?

A

Contain a characteristically hard shell

29
Q

What is a the larval form of T.Solium and T.saginata?

A

cysticercus- fluid filled cyst with an invaginated scolex

30
Q

What is the Echinococcus Granulosus larval stage?

A

Hexacanth

31
Q

What is the larval stage of echinococcus multilocularis?

A

Hyatid

32
Q

What is the apperance of family Anoplocephalidae?

A

No hooks/scolex

Proglottids wider than they are long

33
Q

Describe the life cycle of Anoplocephalidae:

A
  1. Adult tapeworm is found within the hosts small intestine
  2. Eggs are passed out in the faeces
  3. Eggs are ingested by the intermediate host (the mite)
  4. A cysticercoid develops within the intermediate host
  5. Definitive host is infected when it consumest the mite
34
Q

Name the family of the worm shown below:

A

Diphyliidae

35
Q

What is the larval stage (metacestode) of Diphyliidae?

A

a cysticercoid in flea or louse

36
Q

Describe the appearance of Diphylidiiae proglottids in the faeces:

A

has a barrel shaped appearance within the faeces

37
Q

Describe the appearance of Diphylidiiae eggs:

A

Formed in packets 20-30

38
Q

What is the appearance of the Family Hymenolepididae adult?

A

Conical rostellum with a single row of hooks or no-hooks

39
Q
A
40
Q

How many hosts are involved in the life cycle of Hymenolepis?

A

Two host life cycle involving a vertebrate direct host and an indirect invertebrate host.

41
Q

Describe a unique feature of the family Diphyllobothriidae:

A
  • Two elongate grooves (bothria) instead of suckers
42
Q

How many hosts are involved in the lifecycle of Spirometra Erinaceieuropaei?

A

Minimum of three hosts

43
Q

What is a characteristic of the phylum ANCANTHOCEPHALA?

A

thorny headed worms

44
Q

Describe the eggs of Macracantharhynchus

A

Spindle shaoped eggs with three cell layers

VET 278- Parasites (7 decks)

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