Worm Lab - 10.29.07 BI211 11 am Lab/ 11 am Lecture Flatworm...

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10.29.07 BI211 11 am Lab/ 11 am Lecture Flatworm Lab Phylum Platyheminthes—Flatworms I. Introduction 1. All flatworms have bilateral symmetry they live in water, either fresh or marine, or damp terrestrial habitats. Flatworms also have thin bodies between their dorsal and ventral surfaces. They undergo tripoblastic development, but they are acoelmates because they do not have a body cavity. 2. Flatworms are more significant over cnidarians because they can be parasitic. One such parasitic flatworm is the tapeworms. 3. The four classes of flatworms are: 1. Turbellaria ex: Dugesia 2. Monogenea & Trematoda ex: Schistosoma mansoni 3. Cestoda ex: Tapeworms II. Class Turbellaria—The Planarian 1. Turbellarians live in mostly marine environments. These worms are abundant in unpolluted ponds and streams, and they mostly prey on smaller animals or feed off of dead animals. 2. The planarian mainly lives in unpolluted ponds and streams. The planarian moves by using their cilia on the ventral epidermis and gliding along a film of mucus that they secrete. 3. The auricles are the lateral flaps that detect specific chemicals. The planarian’s light sensitive eyespots also help in detecting chemicals. The part of a planarian that is the most sensitive to touch is the ganglia which is a dense cluster of nerve cells. Planarians can learn to modify their
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This note was uploaded on 06/08/2008 for the course BI 211 taught by Professor Wheat during the Fall '07 term at Linn Benton Community College.

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Worm Lab - 10.29.07 BI211 11 am Lab/ 11 am Lecture Flatworm...

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