About Lesson
- are pathogenic or saprophytic
- 15-35 μm in diameter and 300-1000 μm in length.
- have bilaterally symmetrical elongated bodies.
- external body wall is covered by cuticles.
- The head is tripartiate, radially symmetrical having a central mouth which carry six lips.
- g. Heterodera, Meloidogyne etc.
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