Seta
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In biology, setae are any of a number of different bristle- or hair-like structures on living organisms.
Setae on the foreleg of a mayfly
Close-up of the underside of a gecko's foot as it walks on vertical glass
Common house geckos mating on a vertical glass window and showing lamellae under the feet
Pointed setae protruding into the fertile surface tubes of the bracket fungus Fuscoporia gilva
Chaeta
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A chaeta or cheta 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. Polychaete
Seta
…different bristle- or hair-like structures on living organisms. Depending partly on their form and function, protostome setae may be called macrotrichia, chaetae, scales, or informally, hairs. The setal membrane is not cuticularized, so movement is possible. Annelid setae are stiff bristles present on the body…
Specimen of the annelid, Lepidonotus oculatus showing its chaetae projecting laterally, with a microscope image of one of its parapodia and chaetae (inset). Museums Victoria specimen.
bidentate neurochaetae from a Lepidonotus sp. specimen from Museums Victoria