Characteristics:
- Annelida have metameric body's, bilateral symmetry,
- wormlike spiral cleavage, and trochophore larvae
- Paired epidermal setae
- A Closed circulatory system
- Dorsal suprapharyngeal ganglia and ventral nerve cords
- metanephridia or protonephridia
Relationship to other animals : Annelids are a part of the lophotrochozoan brnach of the animalia