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Platyhelminthes (Flatworms)
Platyhelminthes (Flatworms)
This web site is devoted to the study of polyclad flatworms (Phylum: Platyhelminthes, Class: Turbellaria, Order: Polycladida), a group of large, free-living marine flatworms which are mainly found in tropical coral reefs. Collecting images and data about their occurrence, taxonomy and biology these pages may contribute to our knowledge about biology and distribution of these colourful marine invertebrates. [Information of the supplier]
http://www.rzuser.uni-heidelberg.de/~bu6/flatintr.htm
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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.edu).
Among all flatworm species studied thus far, the planarian Schmidtea mediterranea is rapidly emerging as a key model organism for the study of regeneration, tissue homeostasis and stem cell ... [Information of the supplier]
http://smedgd.neuro.utah.edu/
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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 the obligate parasites, most of which live in or on the bodies of vertebrates. Turbellaria is, in particular, considered an invalid class because it is not monophyletic. (It is either paraphyletic--that ... [Information of the supplier]
http://turbellaria.umaine.edu/
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