Where is setae located?

Answer 1

Seta \Se"ta\, n.; pl. Set[ae]. [L. seta, saeta, a bristle.] 1. (Biol.) Any slender, more or less rigid, bristlelike organ or part; as the hairs of a caterpillar, the slender spines of a crustacean, the hairlike processes of a protozoan, the bristles or stiff hairs on the leaves of some plants, or the pedicel of the capsule of a moss. 2. (Zo["o]l.) (a) One of the movable chitinous spines or hooks of an annelid. They usually arise in clusters from muscular capsules, and are used in locomotion and for defense. They are very diverse in form. (b) One of the spinelike feathers at the base of the bill of certain birds.

Answer 2

Setae prevent worms (Annelids) to backslide during locomotion, effectively serving as "anchors".

Answer 3

They are stiff bristles (hair_like) on the earthworm. Its function, to help grip on surface and aid with moving without going backwards. Found in grooming limbs and some mouth parts.