http://www.collembola.org/slides/setaea02.htm - Last updated on 2001.09.05 by Frans Janssens
Checklist of the Collembola: Morphology of the setae: slide 2 of 14


Fig.2. Size of setae. Janssens, F. © 1999.
Classification of setae
Based on the relative size of the setae, two main groups can be distinguished. Setulae are the smallest setae and are fine hairlike or spinous. The true setae are divided into four categories: microchaetae, scales, macrochaetae and bothriotricha. The small hardly differentiated microchaetae cover the body uniformely. The specialised and morphologically distinct larger macrochaetae are less numerous and distributed in a characteristic manner. Scales are highly modified dorsoventrally flattened setae. Trichobothria are very fine and long mechanoreceptive sensory setae.