a. Class Polychaeta - all marine environment worms
b. Class Oligochaeta - Earthworms
c. Class Hirudinea - Leeches
2. Platyhelminthes
a. Class turbellaria - Free living flatworms
b. Class Monogenea - small parasitic flukes
c. Class Trematoda - Parasitic flukes, sheep liver flukes, blood flukes
d. Class Cestoda - parasitic tapeworms that live in humans, dogs, cats, cows, ect.
3. Nematodes
a. Class Chromadorea- roundworm
b. Class Secernentea - main class of nematodes, characterized by numerous caudal papillae or group of sensory organs that are used for identification of nematodes.
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