what are the characteristics of platyhelminthes????
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They are free-living, commensal or parasitic.
They are bilaterally symmetrical and dorsoventrally flattened, triploblastic worm.
Bilaterally symmetrical with the definite polarity of head and tail ends.
Triploblastic i.e. body derived from three embryonic germ layers; ectoderm, mesoderm, and endoderm.
Dorsoventrally fattened i.e. well-developed ventral surface with mouth and gonopore.
Their body generally shapes as a worm but varies from moderately elongated flattened to long ribbon-like and leaf-like.
They are small to moderate in size varying from microscopic to extremely elongated form measuring up to 10-15 meters.
Their body is unsegmented except in class Cestoda.
The majority of them are white, colorless and some derive color from ingested food while free-living form are grey, brown-black or brilliantly colored.
Their anterior end of the body is differentiated into the head.
Mouth and genital pores on the ventral surface are well marked in turbellarians but less marked in cestodes and trematodes.