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Phylum : Platyhelminthes The Flatworms

Phylum : Platyhelminthes The Flatworms. Acoelomates. Classes of Platyhelminthes. Class Turbellaria (e.g., Planaria ) The Flukes Class Trematoda (e.g., Fascioloaris, Clonorchis ) Class Monogenea Class Cestoda (e.g., Taenia ). General Characteristics. Free-living or parasitic

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Phylum : Platyhelminthes The Flatworms

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  1. Phylum : PlatyhelminthesThe Flatworms Acoelomates

  2. Classes of Platyhelminthes • Class Turbellaria (e.g., Planaria) • The Flukes • Class Trematoda (e.g., Fascioloaris, Clonorchis) • Class Monogenea • Class Cestoda (e.g., Taenia)

  3. General Characteristics • Free-living or parasitic • Bilaterally symmetrical, and dorsoventrally flattened • First animals with 3 germ layers - triploblastic • Ectodermis • Mesodermis • Endodermis • Epidermis has cilia or cuticle • Coelom lacking (acoelomate)

  4. General Characteristics cont. • Digestive system incomplete • Excretory system – protonephridia • Nervous system – ladder-like • Respiratory, circulatory, and skeletal system lacking • Most monecious • Some have fragmentation and regeneration (Asexual)

  5. Figure 14.01

  6. Class TurbellariaFreeliving Flatworms • Free-living • Ciliated epidermis • Mouth ventral • Digestive system incomplete

  7. Dugesia w.m. Eyespots Auricle

  8. Figure 14.02 Freshwater Flatworm

  9. Figure 14.co Marine Flatworm

  10. Marine Flatworm

  11. Trematoda and Monogenea The Flukes • Endoparasites • Cuticle covering body • Oral sucker surrounds mouth • Ventral sucker used for attachment • Complex life cycles

  12. Clonorchis

  13. Clonorchis

  14. One Intermediate host Shistosoma – Blood Fuke

  15. Clonorchis – Chinese liver fluke Two Intermediate hosts

  16. CestodaThe Tapeworms • Endoparasites • Body consists of proglottids and scolex • Proglottids snapshots of development • Scolex has structures for attachment (Hooks, suckers and rostellum) • No digestive system

  17. Figure 14.18

  18. Figure 14.19

  19. Taenia scolex

  20. Figure 14.20 Mature Proglottids

  21. Taenia – can get to 30+ feet long

  22. Hydatid Cysts of dog tapeworm in human brain A case of a parasite in the wrong host

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