Examples of chaeta in the following topics:
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- Chitinous hairlike extensions, anchored in the epidermis and projecting from the cuticle, called setae/chaetae are present in every segment.
- Earthworms are the most abundant members of the class Oligochaeta, distinguished by the presence of the clitellum as well as few, reduced chaetae ("oligo- = "few"; -chaetae = "hairs").
- The number and size of chaetae are greatly diminished in Oligochaeta compared to the polychaetes (poly=many, chaetae = hairs).
- A significant difference between leeches and other annelids is the development of suckers at the anterior and posterior ends and an absence of chaetae .
- Unlike earthworms, leeches lack chaetae and have suckers at both ends of the body.