adult head bristle adult labellum sensillum mechanosensory chaeta labellar mechanosensory bristle 2021-11-05T09:58:09Z labial PM sensillum Bristle on the outer surface of the labellum that is solely mechanosensory (Shanbhag et al., 2001). There are two of these on each side and they are found in a lateral position (Shanbhag et al., 2001). labial poreless mechanosensory sensillum FBbt:00051968 VFB:FBbt_00051968 fly_anatomy.ontology mechanosensory sensillum of labellum mechanosensory chaeta of labellum