1. Platyhelminthes: flatworms w Cestoda: tapeworms w Turbellaria: free living flatworms like Planaria w Trematoda: flukes like Schistosoma

2. Platyhelminthes w Have bilateral symmetry w Can be free living or parasitic w Have 3 germ layers and are acoelmate (lacking a cavity between gut and outer wall) w Move by using cilia or by contracting their muscles

3. Platyhelminthes: fluke life cycle Sheep liver fluke w Schistosoma Life Cycle-

4. Tapeworm: Cestoda w Tapewormscolextapeworm

5. Turbellaria; planaria (free living)

6. More turbellarians

7. Flatworm videos w http://www.youtube.com/watch?v=voMKJe a91gg free living flatworm http://www.youtube.com/watch?v=voMKJe a91gg w http://www.youtube.com/watch?v=Ich4Y_ K6GuM&feature=PlayList&p=E9E109312 4E2F9C9&playnext=1&index=11 planaria eating http://www.youtube.com/watch?v=Ich4Y_ K6GuM&feature=PlayList&p=E9E109312 4E2F9C9&playnext=1&index=11 w http://www.youtube.com/watch?v=T6pAfQ Inf2c tapeworm in intestine http://www.youtube.com/watch?v=T6pAfQ Inf2c

8. Phylum Rotifera w Are tiny animals that mainly inhabit fresh water, although some live in the sea or in damp soil. w Have bilateral symmetry and are truly multicellular. w “Rotifer,” derived from Latin, means “wheel-bearer”—a reference to the crown cilia that draws a vortex of water into the mouth. w Pseudocoelomate http://www.youtube.com/watch?v=OSoFwCkTbj0&feature=related

9. Phylum Rotifera w Have specialized organ systems—including a complete digestive tract: with a separate mouth and anus. w Perform a type of reproduction called parthenogenesis (virgin birth): females producing more females from unfertilized eggs.

10. Nematoda: roundworms w Complete digestive tract w Pseudocoelomate w Hydrostatic skeleton under pressure which means only one shape is possible w Longitudinal muscles allow for wriggling, but no circular muscles

11. Phylum Nematoda w Reproduction is usually sexual—females are generally larger than males. w Fertilization is internal, and a female can deposit 100,000 or more fertilized eggs per day. w The zygotes of most species are resistant cells capable of living in harsh conditions. Hookworm

12. Roundworms Pinworm Ascaris: intestinal roundworm 1,000,000 cases in USA: 1.2 billion worldwide Heartworm

13. Ascaris life cycle

14. Removal of Guinea Worm http://www.youtube.com/watch?v=mUz9gqLmyQ0

15. nematodes w http://www.youtube.com/watch?v=JBLem M3tzRM soil nematodes http://www.youtube.com/watch?v=JBLem M3tzRM w http://www.youtube.com/watch?v=gmFHn QKbSM8 lymphatic filariasis (elephantiasis) 1 billion worldwide http://www.youtube.com/watch?v=gmFHn QKbSM8

16. Annelida: segmented worms w Eucoelomate w Segmented body plan w Closed circulatory system w Protostome

17. Annelida: key structures w Metanephridia : kidney like structures w Setae/ parapodia w Clitellum w Aortic arches

18. leeches w Fused segments to allow for blood storage w Blood thinner released to help sucking

19. http://www.youtube.com/watch?v= DZig6EL5B6A&feature=PlayList &p=F648EFCC1BE6AAA3&playn ext=1&index=10 Earthworms in Australia Earthworms are hermaphroditic. They fertilize each other with the clitellum secreting a mucus sack to collect the eggs and sperm. This sack is then placed into the ground until babies are developed.