1. Class Oligochaeta - earthworms
2. Class Hirudinea - leeches
3. Class Polychaete - marine worms
(3) Major Classes of Platyhelminthes
1. Class Turbellaria - free-living flatworms
2. Class Trematoda - flukes
3. Class Cestoda - tapeworms
(2) Major Classes of Nematodes
1. Adenophorea
2. Secernentea
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