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Worms
Chapter 3
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Phylum Platyhelminthes
• Characteristics –Flattened, acoelomate, bilaterally
symmetrical –Unsegmented
–Incomplete or absent gut
–Somewhat cephalized, with ganglion and nerve cords
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–Protonephridia as excretory/osmoregulatory structures
–Most forms monoecious with complex reproductive systems
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Classification
• Domain: Eukarya • Kingdom: Animalia • Phylum: Platyhelminthes • Classes: Turbellaria Monogenea Trematoda Cestoidea
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Platyhelmithes Parasites
• Liver Fluke – Class: Trematoda – Description: Dark reddish-brown, mucousy, feed
on blood – Transmission: mammals get it through ingestion
of vegetation with eggs – Effects: abdominal pain, headache, loss of
appetite, anemia, vomitting
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• Beef Tapeworm – Class: Cestoda – Size: 3m to 5m in length – Description: long and thin, white, appear
segmented – Transmission: Eating undercooked beef – Effects: Generally no symptoms
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• Lung Fluke – Class: Trematoda – Size: 7.5mm to 12mm – Description: looks like a coffee bean – Transmission: consuming raw or undercooked
crustaceans – Effects: coughing
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• Pork Tapeworm – Class: Cestoda – Size: 0.5cm to 20cm – Description: – Transmission: eating raw or undercooked pork – Effects: usually no symptoms
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• Blood Fluke (Schistosomiasis) – Class: Trematoda – Size: 10 mm long – Description: feed on blood, produce 300 to 3000
eggs a day – Transmission: burrows through the skin when
human is in contaminated water – Effects: stunted growth, brain damage
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• Dog Tapeworm – Class: Cestoidia – Size: varies – Description: white, thin, appears segmented – Transmission: eating raw meat or feces – Effects: eggs appear in feces
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