Figure 3: Myrmecophagy in spiders. (a) Zodarion rubidum Simon eating an ant. (b) Femoral organ on Z. rubidum. Note the pore openings in the chitin between the two specialized setae of the femoral organ. Scale bar in (a) = 1 mm, scale bar in (b) = 10 μm. Photo of spider author, SEM of femoral organ Catherine Tuell, used by permission.