1. Good Morning!! 1.SURPRISE!!! You have a new seat! Find your new seat then finish your flap book that you worked on yesterday (You will have 10 minutes after the announcements to finish). 2.Place in basket when finished 3.For early finishers, start working on the sponges coloring worksheet beside the basket.

2. Kingdom: Animalia Phylum: Platyhelminthes (Flatworms) Chapter 25 Section 1

3. Structure and Function Approximately 20,000 species! Acoelomates Bilateral symmetry Definite head region and body organs Very thin Most parasitic Some free-living

4. Where do they live? Parasitic: Inside bodies of animals Free-living: Marine, freshwater, moist land habitats, underside of rocks in swiftly flowing streams

5. Feeding What do they eat? – Dead, or slow-moving organisms – Eat blood and other body tissues

6. Feeding How do they eat? – Pharynx- tubelike muscular organ that extends out of their mouths Releases enzymes that digest prey – Food sucked into digestive tract – Parasitic have feeding structures: – Hooks and suckers

7. Digestion Reduced digestive system: – Mouth, pharynx, gastrovascular cavity No digestive system in some Absorb nutrients from their hosts’ intestines One opening- wastes released through mouth

8. Respiration and Circulation No circulatory or respiratory organs Use diffusion: – distribute O 2 and nutrients in body – remove CO 2 and wastes

9. Excretion Excretory system- network of small tubes throughout the body Flame cells- allow flatworms to excrete waste materials from their bodies Substances exit through pores

10. Response to Stimuli Nervous system – 2 nerve cords with connecting nerve tissue Looks like the rungs of a ladder Swelling containing ganglia that send nerve signals (like a brain) Ganglion- nerve cell bodies that coordinates incoming and outgoing nerve signals

12. Reproduction Hermaphrodites- produce both eggs and sperm Sexual: – 2 different flatworms exchange sperm – eggs fertilized internally Marine: zygotes hatch from cocoons released into the water

13. Asexual: – Regeneration- regrow damaged or missing body parts

14. Movement Contract muscles in body wall Glide using cilia and mucus covering

15. Diversity 3 Classes: Free Living: – Turbellaria Parasitic: – Trematoda – Cestoda

16. Turbellarians Planaria 16% of all flatworms Free-living Most are marine, though some in fresh water & terrestrial

17. Trematodes Parasitic – Infect blood or body organs of their hosts Example: Shistosoma (parastic fluke) Cause the disease Shistosomiasis in humans

18. Life Cycle of Schistosoma 48 hours to find host & urine

19. Cestodes Parasitic Tapeworms Live inside intestines of host Proglottids- contain reproductive organs Animals can get tapeworms by eating plants or drinking water contaminated with tapeworm proglottids

20. Life Cycle of Beef Tapeworm

21. Life Cycle of Pork Tapeworm