1. Flatworms or Who Got Run Over by the Mail Truck

2. I. General Traits or Characteristics A. Simplest animal that possesses bilateral symmetry

3. B. Bilateral symmetry 1. recall that organism has a dorsal and ventral surface 2. also has a left and right side

4. C. Cephalization 1. concentration of nerve tissue in the head of the animal 2. two ventral nerve cords running posteriorly 3. anterior sensory organs

6. D. Triploblastic E. No coelom

7. F. Possesses organ systems 1. digestive system – a. Single opening – b. Tubular muscular pharynx – c. Single arm leading anteriorly – d. Forked branch leading posteriorly – e. Note highly branched nature

8. Muscular pharynx

9. Flatworm feeding http://www.martinmicroscope.com/HDVideo Downloads.htm http://www.martinmicroscope.com/HDVideo Downloads.htm http://www.youtube.com/watch?v=Fq_aSR5F K0Y&NR=1&feature=fvwp http://www.youtube.com/watch?v=Fq_aSR5F K0Y&NR=1&feature=fvwp

10. 2. Reproductive system a. Hermaphroditic b. Both sexes on same organism

11. 3. Excretory system

12. 4. No respiratory nor circulatory system Why not?

13. II. Classes of platyhelminthes A. Turbellaria 1. already described 2. planaria and relatives

14. B. Monogenea 1. parasitic forms 2. ectoparasites

15. C. Trematodes-schistosomiasis

16. D. Cestoidea-tapeworm 1. scolex 2. proglottids 3. de-evolution 4. reproductive machine 5. pieces of “rice” in feces

17. This is HUGE!!!

18. Once you are attached…

20. That is what you call “knockers”

22. Aren’t parasites fun?

23. What does this say??