Planarian
Related Category: Zoology: Invertebrates
common name for several genera of the free-living (turbellarian) flatworms belonging to the order Tricladida, a name that derives from their characteristic three-branched digestive cavities.
As the Turbellaria (Planarians) are the most primitive division of the Platyelmia, the problem of the affinities of this phylum resolves itself into that of the relationships of the Turbellaria.
Planarian worm attacking a millipede
Planet of Minerals
Planet of Minerals Exhibition
Planktonic Polychaete worm
Planning meeting with WWF in Vienna
Plant hopper
Plant-eating dinosaur teeth and jaws
Plant-eating dinosaurs ...
Turbellarians classified as planarians (usually freshwater, non-parasitic) can also reproduce asexually by transverse fission. The body constricts at the midsection, and the posterior end grips a substrate.
 See also: Planaria, Shell, Fluke, Flatworm, Sucker
  
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