Question

How do annelid animals differ from arthropods?

Answer 1

1. Annelids: These organisms are also referred to as 'segmented worms'.
2. Arthropods: These invertebrate animals have jointed appendages.

Differences between Arthropods and Annelids:

Annelida	Arthropoda
1. Their body has segments from the head to the tail which are called metameric segmentation.	1. Incomplete segments are present in the body and metameric segmentation is also incomplete.
2. Closed circulatory system is present i.e., they have blood vessels.	2. Circulatory system is open i.e., without any blood vessels.
3. Respiration takes place through the skin.	3. They respire with the help of gills, tracheae, book lungs, etc.
4. Most of these animals are hermaphrodites.	4. These animals have separate sexes.
5. True body cavity or coelom is present.	5. Hemocoel is present that contains blood.
6. Examples- Nereis, earthworm.	6. Examples- Housefly, cockroach.