TREMATODES

Question 1

Trematodes have direct or indirect lifecycles?

Answer 1

indirect

Question 2

what animal is the first intermediate host in trematodes?

Answer 2

usually a molllusc (snail)

Question 3

What are the various body shapes of trematodes?

Answer 3

1) flattened dorso-ventrally
2) fleshy
3) nematode like (sometimes even round worm like in appearance)

Question 4

TRUE OR FALSE - trematodes have one or more intermediate hosts

Answer 4

TRUE

Question 5

TRUE OR FALSE – The lancet fluke is in NZ

Answer 5

false

Question 6

Where is the liver fluke found?

Answer 6

adults in the bile ducts or small intestine

Question 7

What are the 3 genera of liver flukes?

Answer 7

– Fasciola
– Fascioloides
– Fasciolopsis

Question 8

name features of the Fasciola hepatica:

Answer 8

• Up to 3 cm long
• prominent anterior cone
• fawn to black in colour
• ventral sucker 1/4 of body length behind anterior tip
• genital pore just anterior to ventral sucker

Question 9

in Fasciola hepatica, where are the adults found?

Answer 9

Adults in bile ducts of sheep, cattle, goats (horses, pigs, man)

Question 10

in Fasciola hepatica, what are infections tied to?

Answer 10

suitable snail habitats

Question 11

in Fasciola hepatica, what do the adults feed on?

Answer 11

bile duct lining, blood, bile

Question 12

How many eggs can Fasciola hepatica release?

Answer 12

Release 150x90 m, yellow-brown, operculate eggs (5-10,000/fluke/day)

Question 13

The 1st larval stage is the

Answer 13

miracidium – – a motile, swimming stage

Question 14

TRUE OR FALSE– Fasciola hepatica eggs that fall into water will develop

Answer 14

true

Question 15

Intermediate hosts are mud snails of the genus ____?

Answer 15

Lymnaea