1. Flatworms (Platyhelminthes) & Roundworms (Nematoda)
Chapter 34

2. Key Terms Dorsal – back Ventral – abdomen Anterior – toward the head
Posterior – toward the tail

3. 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.

4. Examples of Flatworms
Planarians

5. Examples of flatworms Tapeworm Tape worm video Lung fluke
Lung Fluke Video

6. 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.

7. Examples of roundworms
Bowel worms
Video
Puppy Parasite