Chitinized appendage of the body wall, developing in the special chaetal follicle, in annelids. There are usually four bundles of chaetae in every segment except the first one. Pl. chaetae.
See also:
ordinary chaetae
genital chaetae
penial chaeta
hair chaeta
needle chaeta
sigmoid chaeta
spermathecal chaeta

Naididae.
Naididae 2 , chaetae.
Enchytraeidae chaetae , chaetal bundles of the Lumbricillus type.

Alternative forms for chaeta : chaetae, chaetal, seta, setae.