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Flatworms (Platyhelminthes) & Roundworms (Nematoda)
Chapter 34
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Key Terms Dorsal – back Ventral – abdomen Anterior – toward the head
Posterior – toward the tail
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Platyhelminthes - Flatworms
Simplest animal with bilateral symmetry. Most have a gastrovascular cavity with one opening. Cephalization – The concentration of nerve cells near the anterior end. Four classes.
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Examples of Flatworms Planarians
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Examples of flatworms Tapeworm Tape worm video Lung fluke
Lung Fluke Video
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Nematoda - Roundworms Long slender bodies that taper at both ends.
Range from microscopic to 4 feet long. Digestive tract with two openings. Separate sexes Cuticle- protective non-cellular layer.
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Examples of roundworms
Bowel worms Video Puppy Parasite
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