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A chaeta or cheta (from Ancient Greek χαίτη (khaítē) 'crest, mane, flowing hair'; pl. chaetae) is a chitinous bristle or seta found on annelid worms, although the term is also frequently used to describe similar structures in other invertebrates such as arthropods.
In most species the edge of the mantle also bears movable bristles, often called chaetae or setae, that may help defend the animals and may act as sensors. In some brachiopods groups of chaetae help to channel the flow of water into and out of the mantle cavity.
Amphinomidae, also known as the fireworms, bristle worms or sea mice, [2] are a family of marine polychaetes, many species of which bear chaetae mineralized with carbonate. [3] The best-known amphinomids are the fireworms, which can cause great pain if their toxin-coated chaetae are touched or trodden on. [ 4 ]
There are four bundles of one to twenty-five chaetae on each segment; these have muscles attached to their bases and can be extended or retracted. [2] Leeches, order Hirudinida, [4] mostly have flattened bodies, usually tapered at both ends. They have a fixed number of segments, 33, but the segmentation is not visible externally because the ...
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Depending partly on their form and function, setae may be called hairs, macrotrichia, chaetae, or scales. The setal membrane is not cuticularized and movement is possible. Some insects, such as Eriogaster lanestris larvae, use setae as a defense mechanism, as they can cause dermatitis when they come into contact with skin. [5]
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