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PHYLUM PLATYHELMINTHES (PLAT –EE- HELL- MIN – THEEZ) FLATWORMS

PHYLUM PLATYHELMINTHES (PLAT –EE- HELL- MIN – THEEZ) FLATWORMS. PLEASE PREPARE TO TAKE NOTES. A. THE MAJORITY OF FLATWORMS ARE PARASITES. CNIDARIANS: RADIAL SYMMETRY TWO LAYERS LACKING MOST ORGAN SYSTEMS. . FLATWORMS : BILATERAL SYMMETRY THREE LAYERS CENTRALIZED NERVOUS SYSTEM

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PHYLUM PLATYHELMINTHES (PLAT –EE- HELL- MIN – THEEZ) FLATWORMS

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

  2. A. THE MAJORITY OF FLATWORMS ARE PARASITES.

  3. 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. B. THE GATEWAY PHYLUM TO THE REST OF THE ANIMAL KINGDOM.

  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???

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