The putative spinning organ in the Termitodesmidae, mid-body leg of Termitodesmus calvus Attems, 1938, female. A–C: External morphology, SEM. A: Overview of leg. B: Detail of tarsus. C: Detail of spinning field. D: Detail of the spinning field with the underlying tubuli, mid-body leg stained with Toluidine blue, light microscopy. Abbreviations: fe = femur, pof = postfemur, prf = prefemur, sf = spinning field, ta = tarsus, ti = tibia, tu = tubuli.