Comment of Planaria
Distribution:
planaria is found in India, Myanmar, UK, USA and U.S.S.R.
Habit and Habitat:
Planaria (Dugesia is a Freshwater triclads. It is found in the Freshwater streams, springs, ponds and lakes under the stones throughout the temperature zone.
General characters:
1) Body of Planaria or Dugesia is elongated, bilaterally symmetrical and dorsoventrally flattened.
2) They are 2-15 mm in length and brown to black in color.
3) Head is triangular with conspicuous auricles and two eyes.
4) Digestive system consists of the mouth, proboscis, pharynx and a branched intestine.
5) Reproduction is sexual, asexual and by regeneration.
6) Pharynx plicate directed backwards.
7) General pore is situated a little posterior to the mouth.
Economic Importance:
They were reported as being capable of eradicating the entire earthworm population on farms.
Diagram of Planaria
