midterm III (helminthology) (trematodes)

Question 1

Answer 1

non-embryonated egg of Fasciola

(in fresh faeces sample)

Question 2

Answer 2

native Cercaria of fascola hepatica

Question 3

Answer 3

Fasciola hepatica

(liver fluke)

• see yellow mass of eggs behind the ventral sucker

Question 4

Answer 4

Fasciola hepatica (preserved sample)

• see the darker branches of intestines filled with blood

Question 5

Answer 5

Paramphistomidosis

(rumen flukes)

• in europe Paramphistomum and calicophoron genres

Question 6

Answer 6

unembryonated egg of rumen fluke

• eccentric zygote surrounded by course yolk

Question 7

Answer 7

rumen fluke attached to a papillae

Question 8

Answer 8

Dicrocolium dendriticum

(lancet fluke)

• transparent whitish body with a string of eggs seen throughout the tissue

Question 9

Answer 9

the egg of dicrocoelium (lancet fluke)

• note the two eye-like excretory cells of the miracidium inside

Question 10

Answer 10

Ants act as a sencond intermediate host for the lancet fluke

(they become infected from feeding on the ejected mucus from the landsnail)

Question 11

Answer 11

chronic Dicrocoeliosis

• thick walled bile ducts in the cut surface of a sheeps liver

Question 12

Answer 12

chronic fasciolosis

• adult flukes in enlarged and opened bile ducts of cattle

Question 13

Answer 13

Rumen fluke (histology)

Question 14

Answer 14

miracidium

-hatches and swims to find a freshwater snail

Question 15

Answer 15

Trematoda: Miracidium inside the egg

Question 16

Answer 16

Trematoda: miracidia

Question 17

Answer 17

Trematoda: sporocyst

Question 18

Answer 18

Trematoda: sporocyst containing rediae

Question 19

Answer 19

Trematoda: sporocyst containing rediae

Question 20

Answer 20

Trematoda: Redia

Question 21

Answer 21

trematoda: cercaria

Question 22

Answer 22

trematoda: full cecaria
- typical of blood flukes

Question 23

Answer 23

trematoda: metacercariae

Question 24

Answer 24

Trematoda: metacercariae

(notice the sucker in the middle)

Question 25

Answer 25

trematoda: migrant young fluke

Question 26

Answer 26

fasciola hepatica (liver fluke)

Acute fasciolosis: haemorrhages on the serosa

Question 27

Answer 27

Fasciola hepatica

(haemorrhagic tracts found in sheeps liver)

Question 28

Answer 28

fasciola hepatica

chronic fasciolosis - flukes found in the bile duct

Question 29

Answer 29

Fasciola hepatica

• Red spikes on surface = trematode
• oral sucker visible in the centre

Question 30

Answer 30

Fasciola hepatica

• parenchyma with dark intestinal cross sections

Question 31

Answer 31

fasciola hepatica

• digested blood in the intestines = liver fluke

Question 32

Answer 32

Fasciola hepatica (common liver fluke)

• chronic stage: enlarged and fibrotic lesions

Question 33

Answer 33

Fasciola hepatica

• enlarged gall bladder and bile duct

Question 34

Answer 34

Fasciola hepatica

• enlarged bile duct wall

Question 35

Answer 35

Chronic fasciolosis

• submandibular oedema

Question 36

Answer 36

preserved eggs of liver fluke

• detected using sedimentation

Question 37

Answer 37

Galba truncatula

• most common host fof fasciola & calicophoron spp.

Question 38

Answer 38

Fascioloides magna (great american liver fluke)

• Dark areas of the intestines filled with blood

Question 39

Answer 39

Fascioloides magna (great american liver fluke)

• caverns in the liver of red deer

Question 40

Answer 40

Fascioloides magna ( great american liver fluke)

• mass of eggs in the liver

Question 41

Answer 41

Rumen fluke

either Paramphistomum or Calicophoron spp.

Question 42

Answer 42

Rumen fluke

either paramphistomum or calicophoron spp.

• 1 large ventral sucker
• 1 smaller oral sucker
• Genital opening in the centre

Question 43

Answer 43

Rumen fluke [oral end]

• either: Paramphistomum or calicophoron spp.

Question 44

Answer 44

Rumen fluke [ventral end]

• either: paramphistomum or calicophoron spp.
• see large ventral sucker

Question 45

Answer 45

Rumen fluke [ventral end] cross section

• either: Paramphistomum of calicophoron spp.

Question 46

Answer 46

rumen fluke [oral end]

• either: paramphistomum or calicophoron spp.

Question 47

Answer 47

Rumen fluke [Ventral end]

• either: paramphistomum or calicophoron spp.

Question 48

Answer 48

Planorbid snail

intermediate host for Paramphostomum spp.

Question 49

Answer 49

Dicrocoelium dendriticum (lancet fluke)

Question 50

Answer 50

Dicrocoelium dendriticum (lancet fluke)

Question 51

Answer 51

Dicrocoelium dendriticum (lancet fluke) eggs

Question 52

Answer 52

land snail

• host of Dicrocoelium dendriticum (lancet fluke)

Question 53

Answer 53

Dicrocoelium dendriticum (lancet fluke)

Cercaria

• found in slime balls on grass

Question 54

Answer 54

Dicrocoelium dendriticum (lancet fluke)

metacercaria

Question 55

Answer 55

chronic dicroeliasis: thickened bile duct

Dicrocoelium dendriticum (lancet fluke)

Question 56

Answer 56

• Dicrocoelium dendriticum* (lancet fluke)
• can be identified by the presence of eggs

Question 57

Answer 57

• Dicrocoelium dendriticum*
• can be identified by presence of eggs

Question 58

Answer 58

• Dicrocoelium dendriticum* (lancet fluke)
• can be identified by presence of eggs

Question 59

how to distinguish between lancet flukes and liver flukes?

Answer 59

Liver flukes: visible digested blood in intestines

Lancet flukes: visible eggs present