The clitellum is a distinct part in the body of earthworm, it is found in

1.  segment 13-14-15

2.  segment 14-15-16

3.  segment 12-13-14

4.  segment 15-16-17

Setae help in locomotion in earthworm but are not uniformly, present in all the segments. They are present in

1.  1st segment

2.  last segment

3.  clitellar segment

4.  20th - 22nd segment