Free-living flatworms, traditionally the Turbellaria, live in the oceans, in fresh water and in moist terrestrial habitats, and a few are parasitic. The planarian Dugesia is a freshwater example, a carnivore or scavenger usually under a centimeter long with a much simpler life history than the parasitic flukes. The marine polyclads are the largest free-living flatworms, sometimes reaching 15 centimeters, and take their name from a highly branched digestive cavity. Flatworms have no body cavity and must respire by diffusion, so no cell can be far from the outside and the body has to stay flat.
Free-Living Flatworms
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UC Museum of Paleontology: Introduction to the Platyhelminthes
UC Museum of PaleontologyIntroduction to the PlatyhelminthesQuote, Introduction to the Platyhelminthes
Planarians are free-living flatworms, and have a much simpler life history.
Planarian (Wikipedia)
Has Member: Planarian, LeadQuote, Has Member: Planarian, Lead
A planarian (also known as a triclad; plural planarians or planaria) is a free-living flatworm of the order Tricladida.
Girardia tigrina (Wikipedia)
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Girardia tigrina, known as the brown planarian or the immigrant triclad flatworm, is a species of dugesiid native to the Americas.
Wikipedia: Pseudobiceros bedfordi
WikipediaHas Member: Persian Carpet Flatworm, LeadQuote, Has Member: Persian Carpet Flatworm, Lead
Pseudobiceros bedfordi (common names Persian carpet flatworm and Bedford's flatworm) is a species of flatworm in the family Pseudocerotidae.
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