part of prothoracic tarsal bristle prothoracic metatarsal segment transverse row bristle Any bracted bristle in one of the transverse bristle rows (TR) of the prothoracic metatarsus (tarsal segment 1). The TRs are located in the anterior compartment. There is sexual dimorphism, with females having 7 to 8 TRs, whereas in males, 2 of the TRs have been replaced by the male specific sex comb and central bristle. FBbt:00004285 VFB:FBbt_00004285 T1 Ts1 TR prothoracic tarsal segment 1 transverse row fly_anatomy.ontology prothoracic metatarsus