Acoelomates: Phylum Platyhelminthes and Nemertea - Biosciweb.net
Acoelomates: Phylum Platyhelminthes and Nemertea - Biosciweb.net
Acoelomates: Phylum Platyhelminthes and Nemertea - Biosciweb.net
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<strong>Acoelomates</strong>: <strong>Phylum</strong> <strong>Platyhelminthes</strong> <strong>and</strong> <strong>Nemertea</strong> <strong>and</strong><br />
Pseudocoelomates: Phyla Nematoda <strong>and</strong> Rotifera & Parasitism 6.10<br />
Lab #6 - Biological Sciences 102 – Animal Biology<br />
<strong>Phylum</strong> <strong>Platyhelminthes</strong><br />
Class Turbellaria = free-living flatworms<br />
‣ Observe the specimens <strong>and</strong>/or diagrams of the species listed below.<br />
‣ Record the descriptive information requested at the end of the lab for each species.<br />
‣ Dugesia sp., a triclad flatworm<br />
‣ an available polyclad flatworm<br />
‣ What are the two major orders of flatworms in the Class Turbellaria?<br />
‣ Observations of a Free-Living Planarian Flatworm<br />
‣ Obtain a living specimen of Dugesia tigrina or Planaria sp. as available in a small<br />
petri dish or watch glass <strong>and</strong> study it under the dissecting microscope.<br />
Species name of your observed specimen:<br />
‣ Note the gliding movement. What causes it?<br />
‣ Using forceps, gently turn your flatworm over. Observe <strong>and</strong> describe the righting response.<br />
‣ How long does the righting response take?<br />
‣ Does the worm avoid obstacles such as a needle or probe without touching them?<br />
‣ Locate the eyespots <strong>and</strong> the “ears” or auricular organs. These organs contain<br />
chemoreceptors for detection of specific molecules (eg. “smell”/olfaction). Place a small<br />
piece of liver in the dish <strong>and</strong> observe <strong>and</strong> record how the worm responds.
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