lack true body cavity - acelomate, unsegmented and flattened dorsoventrally - its shape, incomplete digestive system - excrete unused food or waste through the mouth, allow excretion and osmoregulation - flame cells, both females and male reproductive organs are present - they are hermaphrodites, move freely on the fish's body surface - monogenea are ectoparasites, abdominal pain, diarrhea, and the presence of blood in the urine - snail fever symptoms, parasitic infection of the central nervous system - by Taenia solium,

Phylum Platyhelminthes

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