General characteristic of Annelida

General characters of Annelida
1. Habitat:- mostly aquatic, marine or freshwater, burrowing or free living.

2. Body is elongated and vermiform.

3. Triploblastic,metamerically segmented body.

4. Cuticle (secreted by epidermis) covers the whole body; outer covering.

4. Appendages ( if present ) are unjointed.

5. Locomotory organ:-setae or chetae, segmentally arranged.

6. Respiration through body surface, in some by gills.

7. Blood vascular system:- close type(blood is red due to presence of haemoglobin.

8. Excretion by nephredia (paired and segmented).

9. nervous system:- consist of brain and segmental ganglia.

10. Direct development (when sexes are separate), indirect (when sexes are united).