10 main characteristics of Phylum Annelida are given below:

1. Bilaterally symmetrical and vermiform.
2. Body has more than two cell layers, tissues and organs.
3. Body cavity is a true coelom, often divided by internal septa.
4. Body possesses a through gut with mouth and anus.
5. Body possesses 3 separate sections, a prosomium, a trunk and a pygidium.
6. Has a nervous system with an anterior nerve ring, ganglia and a ventral nerve chord.
7. Has a true closed circulatory system.
8. Has no true respiratory organs.
9. Reproduction normally sexual and gonochoristic or hermaphoditic.
10. Troch phore lava is present during indirect development.

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