Linked from
The 16 pages that link to Seta, each with the reason it gives.
AnnelidBroader topic: Many annelids use segmental setae to grip surfaces or move through sediment.
AnnelidaBroader topic: Earthworm setae grip surrounding soil as muscles extend and shorten the body.
GekkonidaeBroader topic: Dense arrays of setae make close contact with surfaces possible.
BryopsidaBroader topic: The seta elevates the capsule and is one of the sporophyte's defining parts.