2. Adult worm in human & other
vertiberates (sexual reproduction)
Eggs in fresh water (3-7
weeks)
Miracidium (swimming
free in water )
Sporocyst (soft tissue of the
aproprate intermediat
host"snail“ (asexual
reproduction)
1st & 2nd generation of
Redia (snail)
Cercaria free in fresh
water
Metacercaria
(other trematodes)
Schistosoma
5. large and broadly-
flattened,
measuring up to
30 mm long and 15
mm wide.
The anterior end is
cone-shaped.
Extensive branching
of: intestinal ceca,
testes and vitelline
follicles.
Fasciola hepatica
A. Adult:
6.
7. Fasciola hepatica A: Adult
Fasciola hepatica Adult 20 – 30 mm L. X 8
– 13 mm B, ( grey – brown )
Carmine s.
19. Intestinal fluke
Fasciolopsis buski
(Fasciolopsiasis).
•Large fleshy worm Size 20-75
mm X 8-20 mm.
•Oral sucker is smaller than the
ventral sucker.
•Testes are highly branched in
the posterior 3/5 of the body.
•Small branched ovary.
•Short convoluted uterus.
28. Clonorchis sinensis
B. Egg
Distinct operculum.
Small knob at the
opposite end.
Contains a fully
developed miracidium
when discharged in the
faeces.
36. paragonimus westermani
A. Adult:
Shape rounded 7.5-12mm
long X 4-6mm wide &
3.5-5mm deep.
wave ceca.
Oral sucker & acetabulum
almost equal in size.
Testes slightly branched
parallel to each other.
Ovary single, anterior to
testes.