The ultrastructure of chemoreceptor sensilla in Ciniflo (Araneida,Arachnida)

The morphology and ultrastructure of chemoreceptive hairs on the legs or the cribellate spider Ciniflo are described. About 20 bipolar sensory cells innervate each hair. The dendrites of two of these terminate at the hair base and are probably mechanoreceptive in function. The others continue into the hair shaft, where they terminate without branching. The associated sheath and enveloping cells are fully described and their physiological roles discussed. This sensillum is compared with the chemoreceptors of other arthropods.