large basiconic sensillum of antennal segment 3 antennal basiconic sensillum ab2 VFB:FBbt_00067002 FBbt:00067002 Large olfactory basiconic sensillum of the antenna that houses the dendrites of two highly-branched olfactory receptor neurons (Shanbhag et al., 1999), expressing Or59b and Or85a (Couto et al., 2005; Grabe et al., 2016). It has a pore size of about 50 nm and a pore density of about 19 pores per square micrometer (Shanbhag et al., 1999). There are more of these sensilla in females than males (Shanbhag et al., 1999; Grabe et al, 2016). antennal basiconic sensillum LB-I antennal sensillum basiconicum LB-I antennal large basiconic sensillum ab2 fly_anatomy.ontology Corresponds to LB-I of Shanbhag et al. (1999) based on number of neurons and increased number present in female than male.