- The body is triploblastic, segmented, and bilaterally symmetrical.
- There is an open circulatory system , and so the blood does not flow in welldefined blood vessels.
- They exhibit organ level of organization.
- The coelomic cavity is blood-filled.
- They have jointed legs (the word ‘arthropod’ means ‘jointed legs’).
- The body is divided into head, thorax, and abdomen.
For Example: Prawns, butterflies, houseflies, spiders, scorpions and crabs