Class Trematoda

Question 1

Bodily Characteristics

Answer 1

Leaf like body shape
2 suckers for attachment
Cilia covered body

Question 2

Feeding & Digestion

Answer 2

Well developed but incomplete digestive tract

Question 3

Reproduction

Answer 3

Most are monoecious and capable of self fertilization

Question 4

Life cycle type

Answer 4

Complex life cycle

Question 5

Passes in feces and must reach water to develop

Answer 5

Egg

Question 6

Free swimming larva that penetrates tissue of snail

Answer 6

Miracidium

Question 7

Reproduces asexually and can yield redia

Answer 7

Sporocyst

Question 8

Also reproduces asexually and can produce cecaria

Answer 8

Redia

Question 9

Emerge from snail and penetrates second intermediate host or encyst in vegetation to become metacercaria

Answer 9

Cercaria

Question 10

Juvenile flukes
When eaten by definitive host develop into adult fluke

Answer 10

Metacercaria

Question 11

Examples of flukes

Answer 11

Clonorchis sinensis (Chinese liver fluke)
Fasciola hepatica (Sheep liver fluke)
Schistosoma (blood fluke, schistosomiasis)

Question 12

Chinese liver fluke characteristics

Answer 12

Most important human liver fluke
Has one of the most complex life cycles with primary and 2 intermediate hosts and 5 larval stages
Mature in intestine then move bile ducts in liver

Question 13

Sheep liver fluke characteristics

Answer 13

Adults live in liver and bile ducts of liver in sheep
Feed on blood
Eggs passed in feces