encircled by chaeta bristle hair-like structure microacanthoid A sensillum with a long, unicellular, setiform outgrowth that is strongly chitinized. UBERON:6005177 Chaeta and seta differs in the etymology but both refers to same anatomical entity stiff setae FBbt:00005177 eupathidium CLAO:0001098 normal seta setula hair-like process pin seta queta seda setiform organ hair setiform organ unicellular cuticular evagination socket membrane