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Introduction to the Platyhelminthes Life in two dimensions. . .

Introduction to the Platyhelminthes Life in two dimensions. . . The simplest animals that are bilaterally symmetrical and composed of three fundamental cell layers Acoelomate= FLAT! Lack an anus, the same pharyngeal opening both takes in food and expels waste.

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Introduction to the Platyhelminthes Life in two dimensions. . .

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  1. Introduction to the Platyhelminthes Life in two dimensions. . . • The simplest animals that are bilaterally symmetrical and composed of three fundamental cell layers • Acoelomate= FLAT! • Lack an anus, the same pharyngeal opening both takes in food and expels waste

  2. first creature to develop a head, brain, paired senses and a tail, the first to move forward and thus the first to hunt for food and mates • 20,000 kinds of flatworms are alive and well today • fresh and salt-water environments and other nice damp niches, like the insides of other animals. • Fossil Record: Platyhelminths have practically no fossil record (except eggs)

  3. Platyhelminthes Taxonomy • Turbellaria- mostly free-living, includes the planarian (e.g.Dugesia), these are found in the oceans, in fresh water, and in moist terrestrial habitats, and a few are parasitic. • Trematoda- flukes, all parasitic, and have complex life cycles specialized for parasitism in animal tissues. Members of one major taxon of flukes, the Digenea, Schistosoma -- which includes the human lung fluke • Cestoda- tapeworms (Taenia), are intestinal parasites in vertebrates, and they also show anatomical and life history modifications for parasitism

  4. Review of Morphology of Common Flatworm • Bilaterally symmetrical with a head and a tail • Centralized nervous system • Three tissue layers • No body cavity, no circulatory system and no hard skeleton • Colored (e.g. marine flatworms) • With eyespot

  5. Flatworms have both male and female sex organs in the one animal. If you think about it, that's a great way to be. If you're rare and you're looking for a mate and you're traveling alone, you don't have to meet another female or another male. You just have to meet another one. -- Leslie Newman

  6. Philippine Flatworms Area: Malapascua Island, Philippines Pseudoceros sp.

  7. Philippine Flatworms Area: Cebu Island, Moalboal, Philippines Maritigrella sp.

  8. Pseudoceros sp.

  9. Pseudoceros sp.

  10. Philippine Flatworms Area: Puerto Galera, Philippines Pseudoceros sp.

  11. Philippine Flatworms Area: Batangas, Philippines Pseudoceros sp.

  12. Cycloporus sp.

  13. Pseudoceros sp.

  14. Class Trematoda • The image is a fluke (possibly a species of Probolitrema). Flukes, like other parasitic flatworms, have complex life cycles often involving two or more host organisms. • Lung Fluke

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