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Planarians are free-living (non-parasitic) freshwater organisms possessing derivatives of all three germ layers (i.e., ectoderm, mesoderm and endoderm). These animals are renowned for their developmental plasticity and have attracted the attention of generations of biologists (http://planaria.neuro.utah.... [Information of the supplier]
smedgd.neuro.utah.edu/
Traditional, pre-cladistic systems placed the flatworms in a single phylum, the Platyhelminthes, subdivided into the classes Turbellaria, Monogenea, Trematoda, and Cestoda. Turbellarians are the largely free-living flatworms---those that don't parasitize other animals---while the other classes encompass ... [Information of the supplier]
turbellaria.umaine.edu/
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