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Question
Give an account on phylum Annelida.
Answer in Brief
Solution
- The animals in phylum annelida are segmented worms.
- Example: Earth worms, Leeches and a group of marine worms.
- Segmented body shows metamerism which means the property of having repeated homologous organs in each segment.
- The animals possess body cavity called coelom.
- Some organisms show movable bristles called setae.
- They have no legs and no hard skeleton.
- The body is covered by moist outer cuticle.
- A thick multi-layered structure, outside the epidermis provides protection.
- They have a central nervous system with a brain.
- Metabolic wastes are removed by Nephridia.
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