Flatworms roundworms notes

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Flatworms roundworms notes

  1. 1. Warm up 1. What are some characteristics that flatworms and cnidarians share? 2. What are some characteristics that are different?
  2. 2. Platyhelminthes The flatworms
  3. 3. Bilateral Symmetry 3 tissue layers
  4. 4. No body cavity Mouth but no anus Branched intestines Feed on small animals; scavengers Parasites; tapeworms
  5. 5. No skeleton; Body cavity is fluid filled to move and keep shape Sexual reproduction, but hermaphroditic Live in all environments Primitive muscles! Many parasitic for humans Definite nerve organs including eyespots for sensing light Most primitive of the bilateral animals!!! 
  6. 6. CEPHALIZATION: definite head end Collection of nerves in the head; ganglia
  7. 7. Hymenolepis dimunata This is how tapeworm attach to a host. They are found in uncooked meat and fecal material. The host can become VERY SICK!!!
  8. 8. Bilharzia burrows through you skin and moves to your gut. The host becomes very sick. It comes from fouled water. ~250,000,000 people are infected
  9. 9. Sparganosis is from infected water. Humans can get it from reptiles, birds, & other mammals that have it. They can grow up to 14 inches. This flatworm can infect the brain or eyes. Most common in eastern Asia!
  10. 10. Nematoda The roundworms
  11. 11. Bilateral
  12. 12. Digestive cavity Mouth and anus Feed on just about anything Many harmful parasites to humans!
  13. 13. No skeleton Sexual reproduction Found everywhere Name means thread-like
  14. 14. No circulatory system Look like worms, but are NOT! Coelom (body cavity type body plan) Two nerve cords that transmit impulses
  15. 15. These parasites have teeth-like plates to attach them to the intestinal tract. Hookworms can each drink 1.0 ml (1/2 cup) of blood per day. You can get them by walking barefoot then they burrow into your skin and move to your blood.
  16. 16. Trichinella roundworms in human muscle Whipworm found in 50% of puppies; Transmitted to human owners Most common childhood intestinal parasite

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