part of develops from mesothoracic tibial apical bristle Longer and thicker bristle without bracts in the anterior compartment, on the ventral distal region of the mesothoracic tibia, near the joint with the first tarsal segment. It is part of the longitudinal bristle row 8 and it is surrounded by 4 or 5 spur bristles. VFB:FBbt_00004392 FBbt:00004392 fly_anatomy.ontology T2 AB mesothoracic tibia microchaeta mesothoracic leg mechanosensory bristle presumptive mesothoracic tibial apical bristle