large basiconic sensillum of antennal segment 3 obsolete large basiconic sensillum https://github.com/FlyBase/drosophila-anatomy-developmental-ontology/issues/1312 true FBbt:00005188 The largest subtype of basiconic sensilla. It measures 12 micrometers and 2.5 micrometers wide with blunt tips. Directly above the base of the sensillum, the shaft diameter is often somewhat reduced resulting in a club-shaped appearance. The pores are arranged in lines, positioned wider apart than in the small basiconic sensillum. It is innervated by two or 4 sensory neurons. Two subtypes can be identified, base on the internal morphology of the peg (LB-I and LB-II). Large basiconic sensilla are found in the antennal segment 3. large sensillum basiconicum Obsoleted as these only seem to be described in the antenna, making this equivalent to FBbt:00004175 'large basiconic sensillum of antennal segment 3' fly_anatomy.ontology