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CH34: Phylum Platyhelminthes

CH34: Phylum Platyhelminthes. Flatworms. Characteristics of Platyhelminthes. Thin, flat body (acoelomates) Bilateral symmetry 3 tissue layers Endoderm Ectoderm Mesoderm organs and muscles, not present in Cnidarians or Porifera Cephalization. Free-living flatworms are carnivores

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CH34: Phylum Platyhelminthes

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  1. CH34: Phylum Platyhelminthes Flatworms

  2. Characteristics of Platyhelminthes • Thin, flat body (acoelomates) • Bilateral symmetry • 3 tissue layers • Endoderm • Ectoderm • Mesoderm • organs and muscles, not present in Cnidarians or Porifera • Cephalization

  3. Free-living flatworms are carnivores • Do not have respiratory or circulatory system • Diffusion of gasses • Branched cavity with extensions that run into all major tissues • Gastrovascular cavity • Flatworms reproduce sexually or asexually. • fragmentation

  4. Characteristics of Flatworms

  5. Groups of Flatworms • Three major groups of modern flatworms include; • Class Turbellaria, most free-living and some marine,ex Dugesia • Class Cestoda, parasitic tapeworms, ex. Taenia • Class Trematoda, endoparasitic flukes, ex. Fasciola • Class Monogenea, mostly ectoparasites on aquatic animals • Species range in size from less than 1mm to many meters in length.

  6. Class Turbellaria • Planarians and marine flatworms

  7. Class Trematoda • Flukes • Involve several host • Schistosomiasis blood disease from contact with contaminated water

  8. Class Monogenea • Fluke • Ectoparasite

  9. Class Cestoda • Tapeworms • Largest group of endoparasites • Tegument on tissue • Hooks to attach to host (Scolex) • Proglottids to reproduce

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