basiconic sensillum of antennal segment 3 obsolete antennal basiconic sensillum TB-4 2010-01-06T06:53:45Z https://github.com/FlyBase/drosophila-anatomy-developmental-ontology/issues/2107 true Thin antennal basiconic sensillum innervated by the branched dendrites of 4 olfactory receptor neurons (ORNs). fly_anatomy.ontology FBbt:00007421 Obsoleted as this was not identified in multiple subsequent studies (Couto et al., 2005 - FBrf0187305; Grabe et al., 2016 - FBrf0233453; Gonzales et al., 2021 - FBrf0250923; Benton et al., 2025 - FBrf0262710).