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Q.
Turbellarians are free living
UP CPMTUP CPMT 2012
Solution:
On the basis of mode of life, presence or absence of digestive system and cilia on body wall, the phylum platyhelminthes (flatworms) is divided into three classes :
(i) turbellaria,
(ii) trematoda and
(iii) cestoda. Turbellarians are free-living worms called planarians. They are terrestrial, marine or freshwater. Body unsegmented, flattened and is covered with ciliated cellular or syncytial epidermis, containing mucus secreting cells and rod-shaped bodies called rhabdites. Suckers absent. Tango, chemo and photoreceptors common in free-living forms. Mostly hermaphroditic. Examples are Dugesia, Euplanaria, Notoplana, etc.