1. PHYLUM PLATYHELMINTHES (PLAT –EE- HELL-MIN – THEEZ) FLATWORMS
PLEASE PREPARE TO TAKE NOTES.

2. A. THE MAJORITY OF FLATWORMS ARE PARASITES.

3. B. THE GATEWAY PHYLUM TO THE REST OF THE ANIMAL KINGDOM.
CNIDARIANS:
RADIAL SYMMETRY
TWO LAYERS
LACKING MOST ORGAN SYSTEMS.
FLATWORMS:
BILATERAL SYMMETRY
THREE LAYERS
CENTRALIZED NERVOUS SYSTEM
SIMPLE EXCRETORY SYSTEM.
COMPLEX REPRODUCTIVE SYSTEM.
SIMPLE DIGESTIVE SYSTEM.

4. C. THREE CLASSES

5. C. THREE CLASSES
TURBELLARIA - MADE UP OF MOSTLY FREE LIVING FLATWORMS. CAN LIVE IN MARINE, FRESHWATER, AND DAMP TROPICAL ENV.
EXAMPLES: PLANARIA AND POLYCLADIDS.

6. C. THREE CLASSES
TREMATODA – KNOWN AS FLUKES. ALL ARE PARASITIC AND VERY DAMAGING.
EXAMPLES: ASIAN LIVER FLUKE AND SCHISTOSOMES.

7. C. THREE CLASSES CESTODA – KNOWN AS TAPEWORMS. ALL ARE PARASITIC.
EXAMPLES: PORK, BEEF, FISH, & DOG TAPEWORMS.

8. D. THREE LAYERS EPIDERMIS – TOUGH (Outer Layer)
MUSCLE – CIRCULAR AND LONGITUDINAL
MESENCHYME (Connective Tissue)

9. E. NERVOUS SYSTEM SIMPLE BRAIN FOUND AT THE HEAD END.
TWO NERVE CORDS THAT LOOK LADDER LIKE.

10. F. EXCRETORY SYSTEM CONTAINS FLAME CELLS.
(THE CILIA LOOKS LIKE A FLICKERING FLAME)

11. REPRODUCTIVE SYSTEM HERMAPHRODITIC. SEXUAL ONLY
TAPEWORMS CAN POSSIBLY SELF-FERTILIZE.

12. H. DIGESTIVE SYSTEM

13. H. DIGESTIVE SYSTEM ONE OPENING - THE MOUTH PHARYNX AND INTESTINES.
TAPEWORMS DO NOT NEED A DIGESTIVE SYSTEM.

14. I. LIFE CYCLES
TAPEWORM
CP 25

15. I. LIFE CYCLES
FLUKE
CP 23

16. J. MISC.
1. THEY DO NOT HAVE A CIRCULATORY SYSTEM OR A RESPIRATORY SYSTEM. USE DIFFUSION.

17. J. MISC. CONSIDERED ACOELOMATES BECAUSE THEY LACK A BODY CAVITY.
HAVE A HYDROSTATIC SKELETON.
THEY ARE REALLY FLAT!!!

18. ANY QUESTIONS???