Setae are hair like structures on the surface of the earthworm, but setae can come in different shapes depending on the position it is in on the worm. They can come in either rod-shaped, needle shaped or hair-like shaped atorvastatin generic.
The setae are also usually enlarged at either ends of the worm. The setae near the genital pores (where the swapping of sperms take place) is slightly longer, raised up and may have hook like structures on the end. This may help in providing a physical stimuli to their partners, or help by gripping, clasping and penetrating the skin of their partners to hold each other together.