A specialised form of setae (“hairs”) in some insects. They consist of a cup-shaped base, with on top a short dagger- or tube-shaped seta. In Triozidae larvae the margins of the abdomen, wing pads and head bear a row of sectasetae, each one of which produces a long, glistening thread of wax
A number of setasetsae as they are standing along the margin of the wingpads of Trioza remota (from Rapisarda, 1994a).
Trioza remota larva; the sectasetae are too small to be seen, but the wax threads they have produced are conspicuous.