part of twin sensillum of margin 1 d-TSM TSM 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. TSM1 FBbt:00004338 VFB:FBbt_00004338 fly_anatomy.ontology One of two large campaniform sensilla at the most distal point of the wing margin of the distal costa. It is innervated by the first born of the twin sensilla neurons. TSM(1) wing nerve TSM(1) TM1 FBbt:00004081 distal twin sensillum of the wing margin wing margin wing campaniform sensillum