Flatworms are triploblastic acoelomates with bilateral symmetry that can live freely or as parasites. They respire through diffusion and digest food in their gastrovascular cavity. There are three classes of flatworms - Turbellaria, which includes Planaria and feeds on bits of plants and animals; Trematoda or flukes, which are internal parasites with suckers and hooks that feed on host tissues and fluids; and Cestoda or tapeworms, which are segmented worms that lack a digestive system and feed by absorption through their tegument.

2. CHARACTERISTICS
• Flatworm
• Habitat: marine, fresh water & moist land
• Triploblastic acoelomates and bilateral symetry
• Free-living or parasite
• Respiration by difussion
• Food digested in gastrovascular cavity

4. CLASSIFICATION
PLATIHELMINTHES
TURBELARIA
Planaria
TREMATODA
Schistosoma sp (C. Darah)
Fasciola hepatica (C. Hati)
Chlonorchis sinensis (C. Hati manusia)
CESTODA
Taenia solium
Taenia saginata

5. 1. TURBELARIA
• Digestion : scavenging for bits and decaying plant
and animal matter; prey on smaller organisms like
protozoa. Food ingested and digest in
gastrovascular cavity through pharynx; absorb
nutrient and diffuse to another cells

8. ASEXUAL REPRODUCTION IN PLANARIA

9. 2. TREMATODA (FLUKES)
Digestion :
• The fluke feeds on cells, blood,
and other fluids of the host
organism (paracitic)
• covering by tegument
• Have sucker (anterior and
ventral) and hooks  adaptation
for parasitic worms
Life Cycle :
Host : Human and snail; fish or frog

11. Mature flukes in blood
vessels of intestine
Human
host
Snail host
1 Sexual reproduction
of flukes in human;
fertilized eggs pass
out in feces
2 Eggs hatch
in water
3 Larva
that
infects
snail
4 Asexual reproduction
of flukes in snail
5 Larva that
infects
human
6 Larva penetrates
skin and
blood vessels

14. DAUR HIDUPFASCIOLA HEPATICA

15. DAUR HIDUP FASCIOLA HEPATICA

16. 3. CESTODA (TAPEWORM)
Structure :
• The body surrounded by tegument;
• at anterior end contain scolex which has hooks
and sucker;
• behind neck there are thousand proglotids; lack of
digestive system.
Life Cycle :
Host : Human; cow or pig

18. STRUCTURE OF CESTODA

19. SIKLUSHIDUPTaeniaSaginata

20. Lengkapi tabel berikut ini: