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CH27: Sec3 Phylum Platyhelminthes

Discover the characteristics and classification of Platyhelminthes, commonly known as flatworms. Learn about their thin bodies, bilateral symmetry, and lack of respiratory and circulatory systems. Explore the three major groups - Turbellaria, Cestoda, and Trematoda - and their unique features.

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CH27: Sec3 Phylum Platyhelminthes

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  1. CH27: Sec3 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, parasitic flukes, ex. Fasciola • 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 disease from contact with contaminated water

  8. Class Cestoda • Tapeworms • Largest group of endoparasites • Tegument on tissue • Hooks to attach to host • Proglottids to reproduce

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