- Last updated on 2001.09.05 by Frans Janssens
Checklist of the Collembola: Morphology of the setae: slide 1 of 14

Fig.1. Typical shape of a seta. Janssens, F. © 1999.
The basics
A seta (plural: setae) is a cuticular appendage: a hollow outgrowth of the cuticle connected with it by means of a membranous joint. Typically, the hollow setal shaft is an elongated cone having a negative proximodistal gradient in shaft radius, gradually tapering to a point from base to apex. The proximodistal axis of the setal shaft can be straight but is typically slightly bent, once (like a 'comma') or more than once (like an 's').