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Flatworms or Who Got Run Over by the Mail Truck
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I. General Traits or Characteristics A. Simplest animal that possesses bilateral symmetry
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B. Bilateral symmetry 1. recall that organism has a dorsal and ventral surface 2. also has a left and right side
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C. Cephalization 1. concentration of nerve tissue in the head of the animal 2. two ventral nerve cords running posteriorly 3. anterior sensory organs
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D. Triploblastic E. No coelom
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F. Possesses organ systems 1. digestive system – a. Single opening – b. Tubular muscular pharynx – c. Single arm leading anteriorly – d. Forked branch leading posteriorly – e. Note highly branched nature
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Muscular pharynx
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Flatworm feeding http://www.martinmicroscope.com/HDVideo Downloads.htm http://www.martinmicroscope.com/HDVideo Downloads.htm http://www.youtube.com/watch?v=Fq_aSR5F K0Y&NR=1&feature=fvwp http://www.youtube.com/watch?v=Fq_aSR5F K0Y&NR=1&feature=fvwp
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2. Reproductive system a. Hermaphroditic b. Both sexes on same organism
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3. Excretory system
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4. No respiratory nor circulatory system Why not?
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II. Classes of platyhelminthes A. Turbellaria 1. already described 2. planaria and relatives
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B. Monogenea 1. parasitic forms 2. ectoparasites
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C. Trematodes-schistosomiasis
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D. Cestoidea-tapeworm 1. scolex 2. proglottids 3. de-evolution 4. reproductive machine 5. pieces of “rice” in feces
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This is HUGE!!!
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Once you are attached…
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That is what you call “knockers”
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Aren’t parasites fun?
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What does this say??
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