What is the difference between Annelida and Arthropoda?

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Annelida:

1. They have no distinct heads.

2. Exoskeletons are absent.

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3. They have no jointed appendages.

4. Excretion occurs through nephridia.

5. Respiration occurs through skin or parapodia, e.g. earthworm, Aphrodite.

Athropoda:

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1. Body is divided into head, thorax and abdomen.

2. Body is covered by chitinous exoskeletons.

3. They have jointed appendages.

4. Excretion occurs through coxal gland on malpighian tubules.

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5. Respiration occurs through tracheae or book lungs, e.g. prawn, cockroach.

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