Question
Bring out five differences between Annelida and Arthropoda. Name the blood-sucking ectoparasite of Annelida.
| | Annelida | Arthropoda |
| 1. | Body is externally divided into ring-like metameres. | Body is divided into head, thorax and abdomen. |
| 2. | Locomotion is aided by chaetae/ parapodia. | Locomotion is aided by walking legs and/ or wings. |
| 3. | There is a closed circulatory system. | There is an open circulatory system. |
| 4. | Haemoglobin is dissolved in the plasma. | Haemolymph, the body fluid has no respiratory pigment. |
| 5. | Animals are hemaphrodite, i.e., bisexual. | Animals are unisexual. |
| 6. | Respiration is by moist, vascularised skin, i.e., cutaneous. | Respiration is by tracheae, book-lungs or gills. |
| 7. | Excretion is by nephridia. | Excretion is by malpighian tubules or green glands. |
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