part of twin sensillum of margin 2 VFB:FBbt_00004339 p-DSM FBbt:00004082 fly_anatomy.ontology This sensillum was classed as a bristle; however, both the initial reference (Murray et al., 1984) and a recent comprehensive study (Dinges et al., 2020 - FBrf0247616) unambiguously describe it as a campaniform sensillum. proximal twin sensillum of the wing margin FBbt:00004339 TM2 One of two large campaniform sensilla at the most distal point of the wing margin of the distal costa. It is innervated by the second born of the twin sensilla neurons (Murray et al., 1984). wing nerve TSM(2) wing margin wing campaniform sensillum