Class Trematoda

Question 1

Schistosoma mansoni male

Answer 1

15mm long
Possess an oral sucker and acetabulum
Remain in copula - male has female in gynecophoric canal
Cuticle covered with minute papillae
Blood parasite of humans
Causes: Schistosomiasis mansoni

Question 2

Schistosoma mansoni female

Answer 2

10mm long
Possess oral sucker and acetabulum
Only have minute papillae at anterior and posterior end
Blood parasite of humans
Causes: Schistosomiasis mansoni

Question 3

Schistosoma mansoni eggs

Answer 3

Yellowish brown
Elongate
Possess a lateral spine

Question 4

Schistosoma mansoni sporocysts

Answer 4

Elongate, sausage form sacs (some may be branched) containing germinal cells
Able to produce daughter sporocysts, rediae or rarely cercariae

Question 5

Schistosoma japonicum eggs

Answer 5

Oval with a minute lateral spine or knob

Question 6

Fasicola hepatica (whole animal)

Answer 6

Large, thin, leaf shaped
2 suckers (oral and ventral acetabulum)
Humans are definitive host, inhabits bile ducts and liver
Causes fascioliasis or liver rot

Question 7

Fasicola hepatica eggs

Answer 7

Thin shelled, ellipsoid, yellowish coloured
Possess and operculum
Miracidia inside - with cilia

Question 8

Fasicola hepatica miracidia

Answer 8

Naked papillae like protrusion (rostellum) is at the broader anterior end
5 tiers of epidermal plates begin at anterior (bear cilia)
Large gland lies towards the anterior
Flame cells in anterior, each have a long tubule opening to the side of the body (faces posteriorly) - make up the excretory system

Question 9

Clonorchis sinesis

Answer 9

Narrow and elongated body
Possess an oral sucker and acetabulum
Hermaphroditic
Humans are definitive host, inhabit bile ducts
Causes: clonorchiasis

Question 10

Clonochis sinesis eggs

Answer 10

Light bulb or flask shaped
Contain fully developed miracidia (cant tell)
Possess prominent opercular shoulders
Opercula end often has a small lateral protuberance