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Planaria Lab Report

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Words 535
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Joyce Seo
November 7, 2012

The Regeneration of Differently Cut Fragments of D. dorotocephala in a Solely Spring Water Medium
Introduction:
Planaria are free-living flatworms in the phylum Platyhelminthes that mainly live in fresh water, but can be found in the ocean as well as the soil. They all have a similar morphology that consists of a small, flat, bilateral body with a single orifice which functions as both the mouth and anus (Steinbach, 1962). They are usually hermaphroditic species that are able to reproduce both sexually and asexually. Sexual reproduction occurs by exchanging the gametes between two separate organisms. The planaria usually divides into half during asexual reproduction, and regenerates the missing body parts. This

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