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Turbellaria

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Turbellaria is a traditional subdivision of the flatworm phylum Platyhelminthes, covering the roughly 4500 non parasitic species, as distinct from the exclusively parasitic flatworm groups. Turbellarians range from about 1 millimeter to more than 500 millimeters long, lack respiratory and circulatory systems and so rely on diffusion, are mostly predatory, and nearly all reproduce sexually as simultaneous hermaphrodites; molecular studies have since shown Turbellaria is not a single natural lineage, so it survives mainly as a traditional, informal grouping.

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