Planaria Lab

Planaria Lab - 1 Studying the Regenerative Capabilities of...

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1 Studying the Regenerative Capabilities of the Invertebrate Dugesia dorotocephala by Observing Regeneration of Portions of Planarians Cut into Four Segments Introduction Approximately ninety-five percent of animal species are invertebrates, which are organisms that lack a backbone. The focus of this experiment was a member of the phylum Platyhelminthes, which include flatworms, flukes, and tapeworms, which are triploblastic animals with three germ layers (Lum et al., 2008). Dugesia dorotocephala or planarians are the best-known organisms under the Class Tubellarians, which are typically free-living and marine. Planarians are prevalent in unpolluted ponds and streams and they consume smaller animals and feed on dead ones. They move with cilia on their ventral surfaces and glide along a mucus film they secrete. (Campbell and Reece, 2008). A planarian has a pair of light-sensitive eyespots on its head and lateral flaps that detect specific chemicals. The nervous system is complex and centralized. There is a pair of ganglia, dense clusters of nerve cells, at the anterior end of the worm. From the ganglia, a pair of ventral nerve cords runs the length of the body. In this experiment, we focused on its regenerative capabilities. Many planarians can reproduce asexually through fission, where the parent separates into a head and a tail end and each end then regenerates the missing parts (Campbell and Reece, 2008). However, a severed part of an organism can grow into a new individual and the parent regenerates the missing part (Lum et al., 2008). Our planarians were cut into four pieces with a cut above the eyespot, below the eyespot, and longitudinally down the length of the body (Figure One). If planarians have tremendous
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2 regenerative capabilities, then all four portions of the planarian should regenerate lost parts into full planarians. If a portion does not regenerate, it would most likely be the portion above the
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This note was uploaded on 02/16/2009 for the course BISC 120 taught by Professor Webb,wetzer,? during the Fall '07 term at USC.

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Planaria Lab - 1 Studying the Regenerative Capabilities of...

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