| Annelids | Arthropods | |
|---|---|---|
| 1. | True body cavity called coelem | Blood filled body cavity called haemocoel. |
| 2. | Lateral appendages for locomotion. | Jointed legs for locomotion |
| 3. | Closed circulatory system | Open circulatory System. |
| 4. | Body is soft, there is no hard skeleton | Hard Exoskeleton made up of chitin |
| 5. | Body is segmented both externally and internally (septa) | e.g. Body is externally divided but not internally by septa. |
| 6. | e.g. Leech, earthworms etc. | e.g. Insects, spiders, prawns etc. |
